Pyrolysis method of oil and fat bleaching waste white clay and application of solid product thereof

Abstract

The application discloses a pyrolysis method of oil decoloring waste white clay and application of solid products thereof. Oil decoloring waste white clay and waste plastics are placed in a ball mill and uniformly mixed, and after sieving, a mixture is formed; a target pyrolysis temperature and a catalytic temperature of a light wave-microwave oven are regulated; the light wave function is turned on to make the reactor reach the target pyrolysis temperature; the mixture is spirally fed into the reactor; meanwhile, the microwave function is turned on to realize double heating of the mixture inside and outside; pyrolysis gas and solid residues are formed through rapid pyrolysis; the pyrolysis gas is subjected to catalytic reforming through a molecular sieve and is condensed to obtain bio-oil; the non-condensable pyrolysis gas is collected through a gas bag; the solid residues are calcined and sieved, and then are mixed with magnesium oxide as an aggregate, and polyvinyl alcohol, silica sol, carboxymethyl cellulose and the like are used as a binder; after slurry preparation, polyurethane foam cylinder slurry hanging, drying and firing, a porous foam ceramic material is obtained. The application can effectively improve the yield of liquid products, i.e., aromatic hydrocarbon bio-oil, and the solid residues are made into a foam ceramic material with a unique three-dimensional network structure.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of biomass energy conversion, and particularly relates to a pyrolysis method of oil and fat decolorization waste white clay and application of solid products thereof. BACKGROUND

[0002] The oil and fat industry is an important part of the grain and oil food industry in China, and waste white clay is a byproduct generated in large quantities in the decolorization process of edible oil and fat. With the continuous expansion of the edible oil processing industry, the amount of oil and fat decolorization waste white clay has also increased dramatically. It is estimated that 2% to 5% of white clay adsorbent is consumed to treat an average of one ton of oil and fat, and the annual production of waste white clay is more than 1 million tons. Since 20% to 40% of animal and vegetable oils and fats are still contained in waste white clay, long-term storage may pose a risk of oxidation and spontaneous combustion. Direct disposal or landfill not only wastes resources, but also pollutes the soil and groundwater. If waste white clay can be reasonably utilized, it can not only bring certain economic benefits to the oil and fat processing industry, but also reduce environmental pollution and help achieve the national carbon neutralization goal, better building an environmentally friendly society and a resource-saving society. How to properly handle and resourcefully utilize oil and fat decolorization waste white clay has become a problem to be solved.

[0003] Plastic invasion of soil, pollution of air, and pollution of water body are extremely harmful to the ecological system. Plastic garbage is difficult to completely degrade, and plastic products can be degraded into secondary microplastics that are more easily dispersed and more difficult to degrade under the action of light, oxidation, mechanical wear, etc. in the environment. The large accumulation of microplastics in the human body brings unpredictable potential risks to human health. Assessment shows that the global per capita intake of plastic particles is about 2000 per week, and the weight is about 5 grams, equivalent to a credit card. At present, the production rate of plastic products is much higher than the speed of its recycling and natural degradation, and the use amount is still increasing significantly, and it is estimated that the waste plastic produced by humans will reach 12 billion tons by 2050. Efficiently solving the resource recycling of waste plastics, and winning the pollution prevention and control battle, is related to the ecological civilization construction and high-quality development of China. The process route of preparing aromatic hydrocarbons from waste plastics by microwave catalytic pyrolysis has attracted attention at home and abroad. Compared with electric heating, microwave as a new type of heating method applied in catalytic pyrolysis technology has the advantages of uniform heating and energy saving, but the dielectric constant of plastic itself is low and the microwave absorption capacity is not enough. In order to rapidly heat up, microwave absorbing substances need to be added in the reactor.

[0004] At present, researchers are actively exploring the treatment methods and application ways of waste bleaching clay and waste plastics. The oil in waste bleaching clay can be recovered by pressing or extraction, and then prepared into biodiesel through ester exchange reaction; the main method of waste plastic recycling is catalytic cracking to produce fuel oil technology, which cracks the waste plastics first, and then prepares fuel oil through cyclization, aromatization, isomerization and other reactions. However, these methods still have defects such as low efficiency and poor product quality, which restrict the application development of oil decolorization waste bleaching clay and waste plastics. Catalytic pyrolysis technology has the advantages of complete treatment, low process cost, good reduction and volume reduction effect, and is a method with broad application prospect. At present, some studies have used electric pyrolysis method to convert the oil in waste bleaching clay into bio-gasoline, and some studies have used thermal cracking method to convert waste plastics into gasoline through pyrolysis-catalytic upgrading method, in order to partially replace petrochemical fuel oil. As a new type of heating method, microwave is applied to catalytic pyrolysis technology, which has the advantages of uniform heating and energy saving compared with electric heating. The oil decolorization waste bleaching clay has high dielectric constant and excellent microwave absorption characteristics, and the unique thermal effect and non-thermal effect of microwave can possibly coordinate and strengthen the pyrolysis reaction of waste bleaching clay and waste polyethylene plastic mulch from the aspects of dynamics and thermodynamics. If microwave heating is used for oil decolorization waste bleaching clay and waste plastics, it can simplify the steps, save time and reduce equipment investment, which is of great significance to broaden the treatment way of waste bleaching clay. SUMMARY

[0005] In view of the shortcomings of the prior art, the present application aims to provide a pyrolysis method of oil decolorization waste bleaching clay and application of solid products thereof.

[0006] The present application is realized by the following technical solutions.

[0007] The present application provides a pyrolysis method of oil decolorization waste bleaching clay, which comprises the following steps:

[0008] The oil decolorization waste bleaching clay is used as raw material, the target pyrolysis temperature of the light wave-microwave oven is controlled to be 400-750 DEG C, the target catalytic temperature is controlled to be 350-650 DEG C, the light wave function is turned on to make the reactor reach the target pyrolysis temperature, the raw material is spirally fed into the reactor, the microwave function is turned on to realize the double heating of the mixture inside and outside, the rapid pyrolysis forms pyrolysis gas and solid residue, the pyrolysis gas is catalytically reformed by HZMS-5 or HY molecular sieve, and then condensed to obtain bio-oil monocyclic aromatic hydrocarbon, and the non-condensable pyrolysis gas is collected by a gas bag.

[0009] In order to further improve the yield of the bio-oil after pyrolysis, the raw material further comprises waste plastics, the waste plastics are crushed by a crusher, the crushed plastics are mixed with oil decoloring waste clay, and the mixture is sieved to form an oil decoloring waste clay and waste plastic mixture, and the mixture is used as the raw material, because the production raw material of the plastics is mainly olefins, aromatic hydrocarbons and other petrochemical raw materials, and the molecular composition is mainly carbon and hydrogen, and after adding the plastics as the raw material, the waste resource reuse is further realized, and the proportion of aromatic hydrocarbons in the product is increased.

[0010] Further, the waste plastics are food packaging mixed plastics or waste polyethylene plastic mulch.

[0011] Further, the decoloring waste clay is corn oil decoloring waste clay or rice oil decoloring waste clay.

[0012] The application further comprises application of a solid product prepared by the pyrolysis method of the oil decoloring waste clay, and a porous foam ceramic material is prepared by using the solid residue as the raw material, and the specific steps are as follows:

[0013] (1) The solid residue is collected and placed in a tube furnace, and is calcined at 600-1000 DEG C at an air temperature increasing rate of 5-50 DEG C / min for 2-10 h, residual organic matter is removed, and is sieved through a 200-600 mesh sieve, and is mixed with magnesium oxide balls after sieving, as an aggregate of the porous ceramic, polyvinyl alcohol, silica sol, carboxymethyl cellulose and the like are used as a binder, and a proper amount of deionized water is added to prepare a slurry;

[0014] (2) A polyurethane foam cylinder with a diameter of 0.5-10 cm is immersed in the prepared slurry for slurry coating, and the operation is repeated for multiple times, the embryo is naturally dried at room temperature for 2-5 days after slurry coating, and finally the embryo is placed in a muffle furnace and is fired at 1000-1500 DEG C for 1-5 h to obtain the porous foam ceramic material.

[0015] Compared with the prior art, the application has the following beneficial effects:

[0016] (1) The oil decoloring waste clay is used in the application, and the oil decoloring waste clay has high dielectric constant and excellent microwave absorption characteristics, light wave heat transfer and waste clay microwave absorption realize internal and external double heating, the raw material is quickly raised to the target pyrolysis temperature, and the fast pyrolysis is more conducive to the production of liquid phase products than the slow pyrolysis, and the yield of the monocyclic aromatic hydrocarbon can be effectively improved.

[0017] (2) The application further adds waste plastics as the pyrolysis raw material; the molecular composition of the plastics is mainly carbon and hydrogen, and the yield of the aromatic hydrocarbon bio-oil in the product is further improved after pyrolysis; especially, the food packaging mixed plastics are mixed with metal materials such as aluminum, and the metal materials produce a discharge effect under the action of microwaves, and the catalytic pyrolysis reaction is effectively promoted.

[0018] (3) The solid residue after pyrolysis is rich in silicon and aluminum elements, and can be made into a foam ceramic material with a unique three-dimensional network structure, which has potential applications in the fields of biomass pyrolysis catalysis, wastewater purification, flue gas treatment, etc. DETAILED DESCRIPTION

[0019] The application will be further illustrated by the following examples.

[0020] Example 1-3, pyrolysis of corn oil decolorization waste clay to produce oil and solid residue

[0021] Example 1

[0022] The target pyrolysis temperature of the light wave-microwave oven is 550℃, and the target catalytic temperature is 450℃. The light wave function is turned on to make the reactor reach the target pyrolysis temperature, and the corn oil decolorization waste clay is fed into the reactor by a screw. At the same time, the microwave function is turned on to realize double heating of the decolorization waste clay inside and outside, and fast pyrolysis forms pyrolysis gas and solid residue. The pyrolysis gas is catalytically reformed by HZMS-5 molecular sieve, and after condensation, aromatic hydrocarbon bio-oil is obtained. The non-condensable pyrolysis gas is collected by a gas bag. The solid residue after pyrolysis of corn oil decolorization waste clay is collected and placed in a tube furnace. The temperature is raised at a rate of 10℃ / min to 800℃ and calcined for 4h in air. The residual organic matter is removed, and the product is sieved through a 400 mesh sieve. After sieving, it is mixed with magnesium oxide balls by ball milling, used as the aggregate of porous ceramics, and polyvinyl alcohol, silica sol, carboxymethyl cellulose, etc. are used as the binder. An appropriate amount of deionized water is added to prepare the slurry. A polyurethane foam cylinder with a diameter of 1cm is immersed in the prepared slurry for repeated slurry coating. After slurry coating, the embryo is naturally dried at room temperature for 2 days, and finally the embryo is placed in a muffle furnace and fired at 1400℃ for 2h to obtain a porous foam ceramic material.

[0023] The above porous foam ceramic material and HZSM-5 molecular sieve are used to form a two-stage catalyst for microwave-assisted catalytic fast pyrolysis of waste clay oil. 50g of porous foam ceramic material and 50g of HZSM-5 molecular sieve are loaded in a quartz pipe in the order of front and back, and placed in a heating sleeve. The catalytic temperature is adjusted and controlled to be 450℃. 500g of waste clay oil is placed in a pyrolysis reactor. The microwave pyrolysis temperature is adjusted and controlled to be 500℃. After microwave pyrolysis, the vapor passes through the quartz pipe loaded with porous foam ceramic material and HZSM-5 molecular sieve, and after catalytic reforming and condensation, 358.9g of hydrocarbon-rich fuel oil is obtained, of which the aromatic hydrocarbon content is more than 99.0%.

[0024] Example 2

[0025] The target pyrolysis temperature of the light wave-microwave oven is 500°C, and the target catalytic temperature is 450°C. The light wave function is turned on to make the reactor reach the target pyrolysis temperature. The corn oil decolorizing waste clay is fed into the reactor by a screw. At the same time, the microwave function is turned on to realize the double heating of the inside and outside of the decolorizing waste clay. The pyrolysis gas and solid residues are formed by fast pyrolysis. The pyrolysis gas is catalytically reformed by HZMS-5 molecular sieve, and then condensed to obtain aromatic hydrocarbon bio-oil. The non-condensable pyrolysis gas is collected by a gas bag. The solid residues after pyrolysis of the corn oil decolorizing waste clay are placed in a tube furnace and calcined at 850°C for 5h at a temperature rising rate of 15°C / min in air. The residual organic matter is removed, and the calcined product is sieved through a 500-mesh sieve. The sieved product is mixed with magnesium oxide balls as the aggregate of porous ceramics. Polyvinyl alcohol, silica sol, carboxymethyl cellulose, and the like are used as the binder. An appropriate amount of deionized water is added to prepare the slurry. A polyurethane foam cylinder with a diameter of 2cm is immersed in the prepared slurry for repeated slurry coating. The embryo after slurry coating is naturally dried at room temperature for 2 days. Finally, the embryo is placed in a muffle furnace and fired at 1450°C for 2h to obtain a porous foam ceramic material.

[0026] The above porous foam ceramic material and HY molecular sieve are combined to form a two-stage catalyst for microwave-assisted catalytic fast pyrolysis of waste low-density polyethylene (LDPE). 50g of the porous foam ceramic material and 50g of HY are loaded in the quartz pipe in the front and back order, respectively, and placed in a heating jacket. The catalytic temperature is adjusted and controlled to be 500°C. 500g of waste LDPE is placed in the pyrolysis reactor. The microwave pyrolysis temperature is adjusted to 550°C. After microwave pyrolysis, the vapor passes through the quartz pipe loaded with the porous foam ceramic material and HY molecular sieve, and is catalytically reformed and condensed to obtain 319.7g of hydrocarbon-rich fuel oil, of which the gasoline fraction content is more than 92.8%.

[0027] Example 3

[0028] The target pyrolysis temperature of the light wave-microwave oven is 550°C, and the target catalytic temperature is 450°C. The light wave function is turned on to make the reactor reach the target pyrolysis temperature. The corn oil decolorization waste clay is spirally fed into the reactor. At the same time, the microwave function is turned on to realize the internal and external double heating of the decolorization waste clay. The rapid pyrolysis forms pyrolysis gas and solid residue. The pyrolysis gas is catalytically reformed by HZMS-5 molecular sieve, and after condensation, aromatic hydrocarbon bio-oil is obtained. The non-condensable pyrolysis gas is collected by a gas bag. The solid residue after pyrolysis of the corn oil decolorization waste clay is placed in a tube furnace. The temperature is increased at a rate of 10°C / min to 750°C and calcined for 5h in air. The residual organic matter is removed, and the calcined product is sieved through a 400 mesh sieve. The sieved product is mixed with magnesium oxide balls by ball milling to serve as the aggregate of porous ceramics. Polyvinyl alcohol, silica sol, carboxymethyl cellulose, and other adhesives are used as binders. An appropriate amount of deionized water is added to prepare the slurry. A polyurethane foam cylinder with a diameter of 1.5 cm is immersed in the prepared slurry for multiple times. The embryo is naturally dried at room temperature for 2 days after the slurry coating is completed. Finally, the embryo is placed in a muffle furnace and fired at 1400°C for 2h to obtain a porous foam ceramic material.

[0029] The porous foam ceramic material and HZSM-5 molecular sieve are combined to form a two-stage catalyst for microwave-assisted catalytic fast pyrolysis of waste vegetable oil soapstock. 50g of the porous foam ceramic material and 50g of HZSM-5 are sequentially loaded into a quartz tube and placed in a heating jacket. The catalytic temperature is adjusted and controlled to be 450°C. 500g of waste vegetable oil soapstock is placed in a pyrolysis reactor. The microwave pyrolysis temperature is adjusted and controlled to be 550°C. After microwave pyrolysis, the vapor passes through the quartz tube loaded with the porous foam ceramic material and HZSM-5 molecular sieve. After catalytic reforming and condensation, 330.6g of hydrocarbon-rich fuel oil is obtained, with an aromatic hydrocarbon content of more than 99.0%.

[0030] Example 4-6, co-pyrolysis of rice oil decolorization waste clay and mulch to prepare monocyclic aromatic hydrocarbons

[0031] Example 4

[0032] 500g of waste polyethylene plastic mulch is crushed by a crusher. The crushed waste polyethylene plastic mulch is mixed uniformly with 500g of rice oil decolorization waste clay. After sieving, a mixture of rice oil decolorization waste clay and waste polyethylene plastic mulch is formed. The target pyrolysis temperature of the light wave-microwave oven is 550°C, and the target catalytic temperature is 450°C. The light wave function is turned on to make the reactor reach the target pyrolysis temperature. The mixture of rice oil decolorization waste clay and waste polyethylene plastic mulch is spirally fed into the reactor. At the same time, the microwave function is turned on to realize the internal and external double heating of the mixture. The rapid pyrolysis forms pyrolysis gas and solid residue. The pyrolysis gas is catalytically reformed by HZMS-5 molecular sieve, and after condensation, 369.9g of bio-oil is obtained, with a monocyclic aromatic hydrocarbon content of 57.6wt%. The non-condensable pyrolysis gas is collected by a gas bag.

[0033] Example 5

[0034] 500 g of waste polyethylene plastic mulch was crushed by a crusher, and then the crushed waste polyethylene plastic mulch was mixed with 500 g of rice oil decolorizing waste clay to form a mixture of rice oil decolorizing waste clay and waste polyethylene plastic mulch. The target pyrolysis temperature of the light wave-microwave oven was set to 600°C, and the target catalytic temperature was set to 500°C. The light wave function was turned on to make the reactor reach the target pyrolysis temperature. The mixture of rice oil decolorizing waste clay and waste polyethylene plastic mulch was fed into the reactor by a screw feeder, and the microwave function was turned on to realize the double heating of the mixture of rice oil decolorizing waste clay and waste polyethylene plastic mulch from the inside and outside. The fast pyrolysis formed pyrolysis gas and solid residue. The pyrolysis gas was catalytically reformed by HZMS-5 molecular sieve, and then condensed to obtain 377.5 g of bio-oil, wherein the content of monocyclic aromatic hydrocarbons was 61.3 wt%. The non-condensable pyrolysis gas was collected by a gas bag.

[0035] Example 6

[0036] 500 g of waste polyethylene plastic mulch was crushed by a crusher, and then the crushed waste polyethylene plastic mulch was mixed with 500 g of rice oil decolorizing waste clay to form a mixture of rice oil decolorizing waste clay and waste polyethylene plastic mulch. The target pyrolysis temperature of the light wave-microwave oven was set to 650°C, and the target catalytic temperature was set to 550°C. The light wave function was turned on to make the reactor reach the target pyrolysis temperature. The mixture of rice oil decolorizing waste clay and waste polyethylene plastic mulch was fed into the reactor by a screw feeder, and the microwave function was turned on to realize the double heating of the mixture of rice oil decolorizing waste clay and waste polyethylene plastic mulch from the inside and outside. The fast pyrolysis formed pyrolysis gas and solid residue. The pyrolysis gas was catalytically reformed by HZMS-5 molecular sieve, and then condensed to obtain 357.1 g of bio-oil, wherein the content of monocyclic aromatic hydrocarbons was 55.1 wt%. The non-condensable pyrolysis gas was collected by a gas bag.

[0037] Example 7-9 Application of rice oil decolorizing waste clay and waste plastic co-pyrolysis for oil and solid residue

[0038] Example 7

[0039] The rice oil decolorizing waste clay and waste plastics are mixed uniformly in a ball mill, and after sieving, a rice oil decolorizing waste clay and waste plastics mixture is formed. The target pyrolysis temperature of the light wave-microwave oven is regulated to 600°C, and the target catalytic temperature is regulated to 450°C. The light wave function is turned on to make the reactor reach the target pyrolysis temperature. The rice oil decolorizing waste clay and waste plastics mixture is fed into the reactor by a screw, and at the same time, the microwave function is turned on to realize double heating inside and outside the rice oil decolorizing waste clay and waste plastics mixture. Rapid pyrolysis forms pyrolysis gas and solid residues. The pyrolysis gas is catalytically reformed by HZMS-5 molecular sieve, and after condensation, aromatic hydrocarbon bio-oil is obtained. The non-condensable pyrolysis gas is collected by a gas bag. The solid residues after pyrolysis of the rice oil decolorizing waste clay and waste plastics mixture are placed in a tube furnace, calcined at 850°C for 4h at a temperature rising rate of 10°C / min in air, and sieved through a 400-mesh sieve. After sieving, the sieved material is mixed with magnesium oxide balls as the aggregate of porous ceramics, and polyvinyl alcohol, silica sol, carboxymethyl cellulose, etc. are used as the binder. An appropriate amount of deionized water is added to prepare the slurry. A polyurethane foam cylinder with a diameter of 2cm is immersed in the prepared slurry for repeated slurry coating. After slurry coating, the embryo is naturally dried at room temperature for 2 days. Finally, the embryo is placed in a muffle furnace and fired at 1450°C for 2h to obtain a porous foam ceramic material.

[0040] The above porous foam ceramic material and HZSM-5 molecular sieve form a two-stage catalyst for microwave-assisted catalytic rapid pyrolysis of catering waste oil. 50g of the porous foam ceramic material and 50g of ZSM-5 molecular sieve are loaded in a quartz pipe in the order of front and back, and placed in a heating jacket. The catalytic temperature is regulated and controlled to 450°C. 500g of catering waste oil is placed in a pyrolysis reactor. The microwave pyrolysis temperature is regulated to 500°C. After microwave pyrolysis, the vapor passes through the quartz pipe loaded with the porous foam ceramic material and HZSM-5 molecular sieve, and after catalytic reforming and condensation, 370.7g of hydrocarbon-rich fuel oil is obtained, of which the aromatic hydrocarbon content is more than 99.5%.

[0041] Example 8

[0042] The rice oil decolorizing waste clay and waste plastics are mixed uniformly in a ball mill, and after sieving, a rice oil decolorizing waste clay and waste plastics mixture is formed. The target pyrolysis temperature of the light wave-microwave oven is regulated to be 550°C, and the target catalytic temperature is regulated to be 500°C. The light wave function is turned on to make the reactor reach the target pyrolysis temperature. The rice oil decolorizing waste clay and waste plastics mixture is fed into the reactor by a screw, and at the same time, the microwave function is turned on to realize the double heating of the rice oil decolorizing waste clay and waste plastics mixture inside and outside. The pyrolysis gas and solid residues are formed by rapid pyrolysis. The pyrolysis gas is catalytically reformed by HZMS-5 molecular sieve, and after condensation, aromatic hydrocarbon bio-oil is obtained. The non-condensable pyrolysis gas is collected by a gas bag. The solid residues after pyrolysis of the rice oil decolorizing waste clay and waste plastics mixture are placed in a tube furnace, calcined at 800°C for 4h at a temperature rising rate of 10°C / min in air, and sieved through a 400-mesh sieve. After sieving, the sieved material is mixed with magnesium oxide balls as the aggregate of porous ceramics, and polyvinyl alcohol, silica sol, carboxymethyl cellulose, etc. are used as the binder. An appropriate amount of deionized water is added to prepare the slurry. A polyurethane foam cylinder with a diameter of 1cm is immersed in the prepared slurry for repeated slurry coating. After slurry coating, the embryo is naturally dried at room temperature for 2 days. Finally, the embryo is placed in a muffle furnace and fired at 1400°C for 2h to obtain a porous foam ceramic material.

[0043] The above porous foam ceramic material and HY molecular sieve are used to form a two-stage catalyst for microwave-assisted catalytic rapid pyrolysis of waste plastic bags. 50g of the porous foam ceramic material and 50g of HY are sequentially loaded into a quartz pipe and placed in a heating jacket. The catalytic temperature is regulated to be 500°C. 500g of waste plastic bags are placed in a pyrolysis reactor. The microwave pyrolysis temperature is regulated to be 550°C. After microwave pyrolysis, the vapor passes through the quartz pipe loaded with the porous foam ceramic material and HY molecular sieve, and after catalytic reforming and condensation, a hydrocarbon-rich fuel oil 310.5g is obtained, of which the gasoline fraction content is more than 90.7%.

[0044] Example 9

[0045] The rice oil decolorizing waste clay and waste plastics are mixed uniformly in a ball mill, and after sieving, a rice oil decolorizing waste clay and waste plastics mixture is formed. The target pyrolysis temperature is controlled to be 550°C, and the target catalytic temperature is controlled to be 500°C. The light wave function of the microwave oven is turned on to make the reactor reach the target pyrolysis temperature. The rice oil decolorizing waste clay and waste plastics mixture is fed into the reactor by a screw, and the microwave function is turned on to realize double heating inside and outside the rice oil decolorizing waste clay and waste plastics mixture. Pyrolysis is rapidly formed to form pyrolysis gas and solid residues. The pyrolysis gas is catalytically reformed by HZMS-5 molecular sieve, and after condensation, aromatic hydrocarbon bio-oil is obtained. The non-condensable pyrolysis gas is collected by a gas bag. The solid residues after pyrolysis of the rice oil decolorizing waste clay and waste plastics mixture are placed in a tube furnace, calcined at 800°C for 4h at a temperature rising rate of 15°C / min, and sieved through a 500-mesh sieve. After sieving, the sieved rice oil decolorizing waste clay and waste plastics mixture is mixed with magnesium oxide balls as the aggregate of porous ceramics. Polyvinyl alcohol, silica sol, carboxymethyl cellulose, and the like are used as the binder, and an appropriate amount of deionized water is added to prepare the slurry. A polyurethane foam cylinder with a diameter of 3cm is immersed in the prepared slurry for repeated slurry coating. After slurry coating, the embryo is naturally dried at room temperature for 2 days. Finally, the embryo is placed in a muffle furnace and fired at 1450°C for 2h to obtain a porous foam ceramic material.

[0046] The above porous foam ceramic material and HZSM-5 molecular sieve form a two-stage catalyst for microwave-assisted catalytic fast pyrolysis of rapeseed oil soapstock. 50g of the porous foam ceramic material and 50g of HZSM-5 are sequentially loaded into a quartz pipe and placed in a heating jacket. The catalytic temperature is controlled to be 450°C. 500g of catering waste oil is placed in a pyrolysis reactor. The microwave pyrolysis temperature is controlled to be 500°C. After microwave pyrolysis, the vapor passes through the quartz pipe loaded with the porous foam ceramic material and HZSM-5 molecular sieve, and after catalytic reforming and condensation, 343.3g of hydrocarbon-rich fuel oil is obtained, of which the aromatic hydrocarbon content is more than 997%.

[0047] Example 10-12 Co-pyrolysis of corn oil decolorizing waste clay and food packaging mixed plastics to produce oil

[0048] Example 10

[0049] 500g of food packaging mixed plastics were crushed by a crusher, and then the crushed food packaging mixed plastics were mixed with 500g of corn oil bleaching waste clay by a ball mill to form a mixture of corn oil bleaching waste clay and food packaging mixed plastics. The target pyrolysis temperature of the light wave-microwave oven was regulated to be 550℃, and the target catalytic temperature was regulated to be 450℃. The light wave function was turned on to make the reactor reach the target pyrolysis temperature. The mixture of corn oil bleaching waste clay and food packaging mixed plastics was screw-fed into the reactor, and the microwave function was turned on to realize the double heating of the mixture of corn oil bleaching waste clay and food packaging mixed plastics inside and outside. The pyrolysis gas and solid residues were formed by rapid pyrolysis. The pyrolysis gas was catalytically reformed by HY molecular sieve, and 358.4g of bio-gasoline was obtained after condensation. The non-condensable pyrolysis gas was collected by a gas bag.

[0050] Example 11

[0051] 500g of food packaging mixed plastics were crushed by a crusher, and then the crushed food packaging mixed plastics were mixed with 500g of corn oil bleaching waste clay by a ball mill to form a mixture of corn oil bleaching waste clay and food packaging mixed plastics. The target pyrolysis temperature of the light wave-microwave oven was regulated to be 600℃, and the target catalytic temperature was regulated to be 500℃. The light wave function was turned on to make the reactor reach the target pyrolysis temperature. The mixture of corn oil bleaching waste clay and food packaging mixed plastics was screw-fed into the reactor, and the microwave function was turned on to realize the double heating of the mixture of corn oil bleaching waste clay and food packaging mixed plastics inside and outside. The pyrolysis gas and solid residues were formed by rapid pyrolysis. The pyrolysis gas was catalytically reformed by HY molecular sieve, and 369.2g of bio-gasoline was obtained after condensation. The non-condensable pyrolysis gas was collected by a gas bag.

[0052] Example 12

[0053] The food packaging mixed plastics were crushed by a crusher, and then the crushed food packaging mixed plastics were mixed with corn oil bleaching waste clay by a ball mill to form a mixture of corn oil bleaching waste clay and food packaging mixed plastics. The target pyrolysis temperature of the light wave-microwave oven was regulated to be 650℃, and the target catalytic temperature was regulated to be 550℃. The light wave function was turned on to make the reactor reach the target pyrolysis temperature. The mixture of corn oil bleaching waste clay and food packaging mixed plastics was screw-fed into the reactor, and the microwave function was turned on to realize the double heating of the mixture of corn oil bleaching waste clay and food packaging mixed plastics inside and outside. The pyrolysis gas and solid residues were formed by rapid pyrolysis. The pyrolysis gas was catalytically reformed by HY molecular sieve, and 341.7g of bio-gasoline was obtained after condensation. The non-condensable pyrolysis gas was collected by a gas bag.

Claims

1. Application of solid products obtained by pyrolysis of waste clay from oil decolorization, characterized in that: The pyrolysis method of waste clay from oil decolorization includes the following steps: using waste clay from oil decolorization as raw material, regulating the target pyrolysis temperature and target catalytic temperature of a light wave-microwave reactor, turning on the light wave function to make the reactor reach the target pyrolysis temperature, spirally feeding the raw material into the reactor, and simultaneously turning on the microwave function to achieve dual heating of the mixture inside and outside, rapidly pyrolyzing to form pyrolysis gas and solid residue, catalytically reforming and condensing the pyrolysis gas through molecular sieves to obtain bio-oil, and collecting the non-condensable pyrolysis gas through an air bag; The porous foam ceramic material is prepared using the solid residue as a raw material, and the specific steps are as follows: The collected solid residue is placed in a tube furnace and calcined in air at 600-1000°C for 2-10 hours at a heating rate of 5-50°C / min to remove residual organic matter. The solid residue is then passed through a 200-600 mesh sieve and then ball-milled with magnesium oxide to form a porous ceramic aggregate. Polyvinyl alcohol, silica sol, and carboxymethyl cellulose are used as binders, and an appropriate amount of deionized water is added to prepare a slurry. Then, a polyurethane foam cylinder with a diameter of 0.5-10 cm is immersed in the prepared slurry for slurry coating, and the coating is repeated several times. After the coating is completed, the embryo is naturally dried at room temperature for 2-5 days. Finally, the embryo is placed in a muffle furnace and fired at 1000-1500 °C for 1-5 hours to obtain a porous foam ceramic material.

2. The application of the solid product obtained by the pyrolysis method of waste clay for oil decolorization according to claim 1, characterized in that: The raw materials also include waste plastics, which are crushed by a crusher, and then evenly mixed with grease bleaching waste clay, and sieved to form a mixture of grease bleaching waste clay and waste plastics, and the mixture is used as the raw material.

3. The use of the solid product obtained by the pyrolysis method of waste bleaching clay for oil decolorization according to claim 1 or 2, characterized in that: The target pyrolysis temperature is 400-750 °C, and the target catalytic temperature is 350-650 °C.

4. The use of the solid product obtained by the pyrolysis method of waste clay for oil decolorization according to claim 1 or 2, characterized in that: The molecular sieve is HZMS-5 molecular sieve or HY molecular sieve.

5. The use of the solid product obtained by the pyrolysis method of the waste clay for oil decolorization according to claim 2, characterized in that: The waste plastics are mixed food packaging plastics or waste polyethylene plastic mulch films.

6. The method for using the solid product obtained by the pyrolysis method of waste clay for oil decolorization according to claim 1 or 2, characterized in that: The decolorizing waste clay is corn oil decolorizing waste clay or rice oil decolorizing waste clay.