Continuous treatment system and method for low-temperature small cresol in coal gasification

Abstract

The invention discloses a continuous treatment system and method for low-temperature small cresol in coal gasification, and relates to the technical field of treatment systems, and the continuous treatment system comprises an alkali washing unit, an oxidation deodorization unit, a decoloration deodorization unit, an anti-oxidation unit, a rectification unit and an improvement unit. According to the continuous treatment system and method for the medium-low-temperature small cresol in coal gasification, through cooperative arrangement of the alkali washing unit, the oxidation deodorization unit, the decoloration and deodorization unit, the anti-oxidation unit, the rectification unit and the improvement unit, the effects of desulfurization, denitrification, decoloration, deodorization, organic matter removal and anti-oxidation on the medium-low-temperature small cresol in coal gasification can be achieved; the quality of phenol, o-cresol, m-cresol, p-cresol and xylenol products separated from medium and low temperature small cresol is greatly improved, the product quality is ensured, meanwhile, the stability of the products in the coal gasification medium and low temperature small cresol refining process is changed, and the oxidation resistance is improved.

Description

Technical Field

[0001] The invention relates to the technical field of processing systems, and more particularly to a continuous processing system and method for low-temperature cresols in coal gasification. Background Art

[0002] Cresol is a class of organic compounds, one of the isomers of cresol, and has the general properties of phenols. The main source of low-temperature cresol in coal gasification is the crude phenol from coal gasification, which is obtained after the distillation process to remove water, trimethylol, higher phenol, asphalt, colloid and other substances with low content utilization rate. In the industrial production process, cresol will have color or odor due to the influence of factors such as raw materials, reaction conditions, and side reactions, which not only affects the appearance and quality of the product, but also may limit its scope of application. Therefore, it is necessary to decolorize and deodorize cresol.

[0003] The Chinese patent application number is 202210287015.5, which discloses a system and process for deep desulfurization of m-cresol, comprising a raw material tank, an oxidation unit and a distillation unit. The oxidation unit comprises an oxidation kettle, the inlet of which is connected to the outlet of the raw material tank, and the distillation unit comprises a distillation tower and a condenser. The outlet of the oxidation kettle is connected to the distillation tower, and the outlet of the distillation tower is connected to the inlet of the condenser. The outlet of the condenser is connected to the distillation tower and outputs the m-cresol product. The system and process for deep desulfurization of m-cresol have the function of desulfurizing cresol.

[0004] Chinese patent application number 202410655719.2 discloses a continuous process and device for producing cresol by thermal decomposition and detert-butylation of tert-butyl cresol, the structure of which includes a distillation tower, a reactor, a heater, a cooler and a gas-liquid separation tank; the material containing tert-butyl cresol undergoes thermal decomposition and detert-butylation reaction under the action of a catalyst, the reaction temperature is 120-250°C, and the liquid space velocity is 5.0-20h-1; the reaction liquid phase product and the reaction gas phase product enter the distillation tower, the operating pressure of the distillation tower is -95kpa to -50kpa, the top temperature is 110-172°C, the bottom temperature is 120-250°C, and the reflux ratio is 0.8-3; the material at the top of the distillation tower is cooled and separated into gas and liquid, the gas phase material containing isobutylene is extracted from the top of the gas-liquid separation tank, and part of the liquid phase product is extracted from the bottom and returned to the top of the distillation tower as reflux, and part of it is used as feed for subsequent processes; the material at the bottom of the distillation tower is pumped into the reactor. The continuous process and device for producing cresol by thermally decomposing tert-butyl cresol and removing tert-butyl have the effects of improving efficiency and reducing efficiency.

[0005] The current devices for cresol still have the following problems:

[0006] 1. Since there are a large amount of sulfides, nitrides, oxides, and organic matter in cresol, it is difficult to remove them after desulfurization, distillation, etc., resulting in the cresol product after filtration still containing a large amount of harmful ingredients, resulting in a decrease in quality, which will still affect subsequent production.

[0007] 2. During storage or use, cresol will undergo an oxidation reaction with oxygen in the air, causing changes in its properties, such as darkening of color and generation of odor. The existing processes applied to cresol cannot effectively improve the antioxidant and light resistance of cresol, causing cresol to undergo photolysis reaction under light, resulting in changes in molecular structure, which in turn affects its performance.

[0008] Therefore, it is necessary to propose a continuous treatment system and method for low-temperature cresols in coal gasification to solve the above problems. Summary of the invention

[0009] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a continuous treatment system and method for low-temperature cresols in coal gasification to solve the problems raised in the above background technology.

[0010] The technical solution is as follows: the present invention comprises:

[0011] An alkali washing unit, the alkali washing unit comprising an alkali liquid storage tank and an alkali liquid settling tank, the water outlet of the alkali liquid storage tank is connected to the water inlet of the alkali liquid settling tank through a mixer, and the other water inlet of the mixer is connected to the supply end of the microcresol raw material;

[0012] An oxidative deodorization unit, the oxidative deodorization unit comprising a hydrogen peroxide storage tank and an oxidant settling tank, the water outlet of the hydrogen peroxide storage tank being connected to the water inlet of the oxidant settling tank via a mixer, and the other water inlet of the mixer being connected to the water outlet of the alkali solution settling tank;

[0013] A decolorization and deodorization unit, comprising a dilute acid storage tank and a decolorization and deodorization sedimentation tank, wherein the water outlet of the dilute acid storage tank is connected to the water inlet of the decolorization and deodorization sedimentation tank through a mixer, and the other water inlet of the mixer is connected to the water outlet of the oxidant sedimentation tank;

[0014] An antioxidant unit, the antioxidant unit comprises a first stirring tank, the water outlet end of the decolorization and deodorization sedimentation tank is connected to the water inlet end of the first stirring tank, and the top of the first stirring tank is connected to an antioxidant feeding pipe;

[0015] A distillation unit, wherein the discharge pipe at the bottom of the first stirring tank is connected to the distillation unit;

[0016] The improvement unit comprises a second stirring tank, the feed end of the second stirring tank is connected to the discharge pipe of the distillation unit, the top of the second stirring tank is connected to the antioxidant feed pipe, and the discharge pipe at the bottom of the second stirring tank discharges the finished product cresol.

[0017] Furthermore, the alkali solution storage tank stores liquid alkali solution with a concentration of 15%-30%, the hydrogen peroxide storage tank stores hydrogen peroxide with a concentration of 20%-30%, and the dilute acid storage tank stores acid solution, which is one of phosphoric acid with a concentration of 40%-60%, sulfuric acid with a concentration of 50%-98%, or hydrochloric acid with a concentration of 15%-25%.

[0018] Furthermore, nitrogen pipelines are installed inside the first stirring tank and the second stirring tank, and the nitrogen pipelines spray nitrogen to all around.

[0019] Furthermore, the distillation unit includes a distillation tower and a condenser, the distillation tower and the condenser are connected, the feed end of the distillation tower is connected to the discharge pipe of the first stirring tank, and the discharge end of the condenser is connected to the feed end of the second stirring tank.

[0020] The continuous treatment method of low-temperature cresol in coal gasification comprises the following steps:

[0021] S1, alkali washing: mixing the cresol raw material with the liquid alkali in the alkali storage tank through a mixer and transporting them to the alkali settling tank, and removing the sulfide in the cresol through alkali washing in the alkali settling tank;

[0022] S2, oxidative deodorization: the cresol after alkali washing is mixed with hydrogen peroxide in a hydrogen peroxide storage tank through a mixer, and then transported to an oxidant settling tank for reaction to remove the odor in the cresol, while the generated disulfide remains in the cresol;

[0023] S3, decolorization and deodorization: the oxidatively deodorized cresol is mixed with the acid solution in the dilute acid storage tank through a mixer, and then transported to a decolorization and deodorization sedimentation tank for reaction to remove nitrogen oxides in the cresol;

[0024] S4, anti-oxidation: transporting the decolorized and deodorized cresol into a first stirring tank, adding an antioxidant into the first stirring tank through an antioxidant feeding pipe, uniformly mixing the cresols through a stirring device, introducing nitrogen into the first stirring tank through a nitrogen pipeline during stirring, and obtaining a refined cresol raw material after stirring;

[0025] S5, distillation: the anti-oxidized cresol refined raw material is sequentially passed through a distillation tower and a condenser to achieve the effect of passivating the cresol;

[0026] S6. Improve performance: The distilled cresol is transported into a second stirring tank, and an antioxidant is added into the second stirring tank through an antioxidant feeding pipe, and the mixture is uniformly mixed by a stirring device. During stirring, nitrogen is introduced into the second stirring tank through a nitrogen pipeline, and a finished cresol is obtained after stirring.

[0027] Furthermore, the antioxidants added in the S4 antioxidant step are, in sequence, a saturated aqueous solution of aluminum sulfate (or copper sulfate), a 3:2 aqueous solution of a mixture of triammine phosphate and ethylenediaminetetraacetic acid, a 3:2 aqueous solution of sodium hypophosphite and 1,2-propylenediaminetetraacetic acid, and an antioxidant ZQ24, wherein the saturated aqueous solution of aluminum sulfate (or copper sulfate) is 500-2000PPM of the amount of cresol added; the 3:2 aqueous solution of a mixture of triammine phosphate and ethylenediaminetetraacetic acid is 50-300PPM of the amount of cresol added; the 3:2 aqueous solution of sodium hypophosphite and 1,2-propylenediaminetetraacetic acid is 50-300PPM of the amount of cresol added; and the antioxidant ZQ24 is 100-500PPM of the amount of cresol added.

[0028] Furthermore, the antioxidants added in the S6 performance improvement step are dimethyl ketoxime (or hydrazine hydrate or carbohydrazide) and antioxidant ZQ76, wherein the amount of dimethyl ketoxime (or hydrazine hydrate or carbohydrazide) added is 50-500PPM of the amount of cresol added; the amount of antioxidant ZQ76 added is 100-500PPM of the amount of cresol added.

[0029] Furthermore, the amount of liquid alkali solution added in the alkali washing step S1 is 0.5%-3% of the amount of cresol used, and the temperature of the alkali solution during mixing in the alkali solution settling tank is 40°C-60°C.

[0030] Furthermore, the amount of hydrogen peroxide added in the S2 oxidation deodorization step is 0.5-3% of the cresol, and the temperature during mixing in the oxidant settling tank is 40°C-60°C.

[0031] Furthermore, the amount of acid added in the S3 decolorization and deodorization step is 0.5-3% of the cresol, and the temperature during mixing in the decolorization and deodorization sedimentation tank is 50°C-60°C.

[0032] Compared with the existing known technologies, the technical solution provided by the present invention has the following significant effects:

[0033] 1. Through the coordinated setting of alkali washing unit, oxidation deodorization unit, decolorization and deodorization unit, antioxidant unit, distillation unit and improvement unit, the low-temperature small cresols in coal gasification can be desulfurized, denitrified, decolorized, deodorized, deorganic and antioxidant, so that the quality of the finished products of phenol, o-cresol, m-p-cresol and xylenol after separation of low-temperature small cresols is greatly improved, ensuring the product quality.

[0034] 2. By setting up a double anti-oxidation step in the process steps of low-temperature cresol in coal gasification, the stability of the refining process and products of low-temperature cresol in coal gasification is changed, the antioxidant capacity is increased, and the problem that phenol products are easily oxidized during storage and transportation is solved. By setting up double anti-oxidation measures, the product can be effectively prevented from contacting with oxygen, reducing the occurrence of oxidation reactions, thereby maintaining the purity and stability of the product and improving the quality of the final product. At the same time, it helps to slow down the quality decline rate of phenol products over time, and can maintain its original properties for a longer period of time. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the present invention from the alkali washing unit to the distillation unit;

[0036] Figure 2 It is a schematic diagram of the structural distillation unit to the improvement unit of the present invention;

[0037] Figure 3 It is a schematic diagram of the process of the present invention.

[0038] Reference numerals:

[0039] 101. Alkali solution storage tank; 102. Alkali solution sedimentation tank; 103. Hydrogen peroxide storage tank; 104. Oxidant sedimentation tank; 105. Dilute acid storage tank; 106. Decolorization and deodorization sedimentation tank; 107. First stirring tank; 108. Antioxidant feeding pipe; 109. Nitrogen pipeline; 110. Mixer; 111. Distillation unit; 112. Second stirring tank. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0041] Depend on Figures 1 to 3 Given, including:

[0042] Alkali washing unit, the alkali washing unit includes an alkali liquid storage tank 101 and an alkali liquid settling tank 102. The alkali liquid storage tank 101 stores liquid alkali liquid, and the alkali liquid is used to remove a small amount of hydrogen sulfide, mercaptan, thiophenol, and organic acid in the low-temperature cresol in coal gasification. The water outlet of the alkali liquid storage tank 101 is connected to the water inlet of the alkali liquid settling tank 102 through a mixer 110. Fresh alkali liquid needs to be continuously added during continuous operation. The other water inlet of the mixer 110 is connected to the cresol raw material supply end. It should be noted that when the chromatographic inspection coal Gasification low-temperature cresol contains organic acids (butyric acid, valeric acid, caproic acid, heptanoic acid, octanoic acid, nonanoic acid, hemp acid), etc. The amount of solid alkali required for the reaction should be calculated theoretically according to the type of organic acid and alkali used, and then the loss of incomplete reaction is added to obtain the actual amount of solid alkali used. The actual amount used is: the theoretical solid alkali calculated reaction amount × 1.0-2.0, diluted with water to a 30% concentration of alkali solution + 0.5%-3% alkali solution (30% concentration) based on the amount of coal gasification low-temperature cresol raw material;

[0043] The oxidation deodorization unit includes a hydrogen peroxide storage tank 103 and an oxidant settling tank 104. The hydrogen peroxide storage tank 103 stores hydrogen peroxide. Under the action of hydrogen peroxide, organic matter, mercaptans, etc. in the low-temperature cresol in coal gasification react with oxygen to be converted into disulfides, thereby removing the odor in the low-temperature cresol in coal gasification. The generated disulfides remain in the phenol. At the same time, by converting toxic mercaptans into relatively stable disulfides, the pollution risk to the environment can be effectively reduced. The reaction equation is: 4RSH+O2→2RSSR+2H2O. The water outlet of the hydrogen peroxide storage tank 103 is connected to the water inlet of the oxidant settling tank 104 through a mixer 110. The other water inlet of the mixer 110 is connected to the water outlet of the alkali solution settling tank 102. The mixer 110 is preferably a Venturi mixer 110.

[0044] The decolorization and deodorization unit includes a dilute acid storage tank 105 and a decolorization and deodorization settling tank 106. Acid liquid is stored in the dilute acid storage tank 105, which can remove nitrogen oxides in low-temperature cresols in coal gasification. Nitrogen oxides are contained in large quantities in phenol oil. The presence of nitrogen oxides will cause the phenolic products to have poor antioxidant capacity and cause a strong odor. The water outlet of the dilute acid storage tank 105 is connected to the water inlet of the decolorization and deodorization settling tank 106 through a mixer 110. The other water inlet of the mixer 110 is connected to the water outlet of the oxidant settling tank 104. The pipe wall, pipeline, and equipment of the oxidant settling tank 104 are made of acid-resistant materials and need to be treated to prevent acid corrosion. The interior of the settling tank is made of enamel material.

[0045] The antioxidant unit has the function of improving the antioxidant and light resistance of the product after the separation of low-temperature cresols in coal gasification, improving the product appearance color, and extending the product shelf life. The antioxidant unit includes a first stirring tank 107, the water outlet end of the decolorization and deodorization sedimentation tank 106 is connected to the water inlet end of the first stirring tank 107, and the top of the first stirring tank 107 is connected to an antioxidant feeding pipe 108;

[0046] The distillation unit 111, the discharge pipe at the bottom of the first stirring tank 107 is connected to the distillation unit 111, which plays a role of passivation. The distillation equipment is an existing device and will not be described in detail here;

[0047] The improvement unit has the function of improving the antioxidant properties of the separated product and improving its anti-oxidation and anti-light capabilities, thereby improving its appearance color and extending its shelf life. The improvement unit comprises a second stirring tank 112, the feed end of the second stirring tank 112 is connected to the discharge pipe of the distillation unit 111, the top of the second stirring tank 112 is connected to the antioxidant feed pipe 108, and the discharge pipe at the bottom of the second stirring tank 112 discharges the finished product cresol.

[0048] Specifically, the alkali solution storage tank 101 stores a liquid alkali solution with a concentration of 15%-30%. Preferably, sodium carbonate (Na2CO3), sodium hydroxide (NaOH), and sodium bicarbonate (Na2HCO3) with relatively low prices can be selected and dissolved with water to form a 15%-30% liquid alkali solution. The hydrogen peroxide storage tank 103 stores hydrogen peroxide with a concentration of 20%-30%. The dilute acid storage tank 105 stores acid solution, which is one of phosphoric acid with a concentration of 40%-60%, sulfuric acid with a concentration of 50%-98%, or hydrochloric acid with a concentration of 15%-25%.

[0049] Specifically, nitrogen pipelines 109 are installed inside the first stirring tank 107 and the second stirring tank 112. The nitrogen pipelines 109 spray nitrogen around. By introducing inert gas into the tank body, it can not only prevent oxidation but also stir the materials inside.

[0050] Specifically, the distillation unit 111 includes a distillation tower and a condenser, which are connected to each other. The distillation tower and the condenser are both existing equipment and will not be described in detail here. The feed end of the distillation tower is connected to the discharge pipe of the first stirring tank 107, and the discharge end of the condenser is connected to the feed end of the second stirring tank 112.

[0051] The continuous treatment method of low-temperature cresol in coal gasification comprises the following steps:

[0052] S1, alkali washing: the cresol raw material is mixed with the liquid alkali in the alkali storage tank 101 through the mixer 110 and then transported to the alkali settling tank 102, the alkali storage tank 101 outputs the alkali while replenishing the alkali, the waste liquid is discharged from the bottom of the alkali settling tank 102, and the sulfide in the cresol is removed after the alkali washing in the alkali settling tank 102;

[0053] S2, oxidative deodorization: the alkali-washed cresol is mixed with the hydrogen peroxide in the hydrogen peroxide storage tank 103 through the mixer 110, the hydrogen peroxide storage tank 103 is replenished while discharging the hydrogen peroxide, and the waste liquid is synchronously discharged from the bottom of the oxidant settling tank 104, and the mixed waste liquid is transported to the oxidant settling tank 104 for reaction, thereby removing the odor in the cresol, and the generated disulfide remains in the cresol;

[0054] S3, decolorization and deodorization: the oxidatively deodorized cresol is mixed with the acid solution in the dilute acid storage tank 105 through the mixer 110, the dilute acid storage tank 105 is replenished with dilute acid while discharging the acid solution, and the waste liquid is discharged from the bottom of the decolorization and deodorization sedimentation tank 106, and the waste liquid is mixed and transported to the decolorization and deodorization sedimentation tank 106 for reaction to remove nitrogen oxides in the cresol;

[0055] S4, anti-oxidation: transport the decolorized and deodorized cresol into the first stirring tank 107, and add an antioxidant into the first stirring tank 107 through an antioxidant feeding pipe 108, wherein the added antioxidants are saturated aqueous solution of aluminum sulfate (or copper sulfate), a 3:2 aqueous solution of a mixture of triamine phosphate and ethylenediaminetetraacetic acid, a 3:2 aqueous solution of sodium hypophosphite and 1,2-propylenediaminetetraacetic acid, and an antioxidant ZQ24, and uniformly mix them through a stirring device, and nitrogen is introduced into the first stirring tank 107 through a nitrogen pipeline 109 during stirring, and a refined raw material of cresol is obtained after stirring;

[0056] S5, distillation: the anti-oxidized cresol refined raw material is sequentially passed through a distillation tower and a condenser to achieve the effect of passivating the cresol;

[0057] S6. Improve performance: The distilled cresol is transported into the second stirring tank 112, and an antioxidant is added into the second stirring tank 112 through the antioxidant feeding pipe 108. The added antioxidants are dimethyl ketoxime (or hydrazine hydrate or carbohydrazide) and antioxidant ZQ76 in sequence. The mixture is evenly mixed by a stirring device. During stirring, nitrogen is introduced into the second stirring tank 112 through the nitrogen pipeline 109. After stirring, the cresol finished product is obtained.

[0058] Specifically, the antioxidants added in the S4 antioxidant step are, in sequence, a saturated aqueous solution of aluminum sulfate (or copper sulfate), a 3:2 aqueous solution of a mixture of triammine phosphate and ethylenediaminetetraacetic acid, a 3:2 aqueous solution of sodium hypophosphite and 1,2-propylenediaminetetraacetic acid, and an antioxidant ZQ24, wherein the saturated aqueous solution of aluminum sulfate (or copper sulfate) is 500-2000PPM of the amount added to the cresol; the 3:2 aqueous solution of a mixture of triammine phosphate and ethylenediaminetetraacetic acid is 50-300PPM of the amount added to the cresol; the 3:2 aqueous solution of sodium hypophosphite and 1,2-propylenediaminetetraacetic acid is 50-300PPM of the amount added to the cresol; and the antioxidant ZQ24 is 100-500PPM of the amount added to the cresol.

[0059] Specifically, the antioxidants added in the S6 performance improvement step are dimethyl ketoxime (or hydrazine hydrate or carbohydrazide) and antioxidant ZQ76, wherein the amount of dimethyl ketoxime (or hydrazine hydrate or carbohydrazide) added is 50-500PPM of the amount of cresol added; the amount of antioxidant ZQ76 added is 100-500PPM of the amount of cresol added.

[0060] Specifically, the amount of liquid alkali solution added in the alkali washing step S1 is 0.5%-3% of the amount of cresol used, and the temperature during mixing in the alkali solution settling tank 102 is 40° C.-60° C. to prevent the mixing from being affected by too low a temperature.

[0061] Specifically, the amount of hydrogen peroxide added in the S2 oxidation deodorization step is 0.5-3% of the cresol, and the temperature during mixing in the oxidant settling tank 104 is 40°C-60°C.

[0062] Specifically, the amount of acid added in the decolorization and deodorization step S3 is 0.5-3% of the cresol, and the temperature during mixing in the decolorization and deodorization sedimentation tank 106 is 50° C.-60° C.

[0063] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A continuous treatment system for low-temperature cresols in coal gasification, characterized in that: include: An alkali washing unit, the alkali washing unit comprising an alkali liquid storage tank (101) and an alkali liquid settling tank (102), the water outlet of the alkali liquid storage tank (101) being connected to the water inlet of the alkali liquid settling tank (102) via a mixer (110), and the other water inlet of the mixer (110) being connected to a supply end of a microcresol raw material; An oxidative deodorization unit, the oxidative deodorization unit comprising a hydrogen peroxide storage tank (103) and an oxidant settling tank (104), the water outlet of the hydrogen peroxide storage tank (103) being connected to the water inlet of the oxidant settling tank (104) via a mixer (110), and the other water inlet of the mixer (110) being connected to the water outlet of the alkali solution settling tank (102); A decolorization and deodorization unit, the decolorization and deodorization unit comprising a dilute acid storage tank (105) and a decolorization and deodorization sedimentation tank (106), the water outlet end of the dilute acid storage tank (105) is connected to the water inlet end of the decolorization and deodorization sedimentation tank (106) through a mixer (110), and the other water inlet end of the mixer (110) is connected to the water outlet end of the oxidant sedimentation tank (104); An antioxidant unit, the antioxidant unit comprising a first stirring tank (107), the water outlet end of the decolorization and deodorization sedimentation tank (106) is connected to the water inlet end of the first stirring tank (107), and the top of the first stirring tank (107) is connected to an antioxidant feeding pipe (108); A distillation unit (111), wherein a discharge pipe at the bottom of the first stirring tank (107) is connected to the distillation unit (111); The improvement unit comprises a second stirring tank (112), the feed end of the second stirring tank (112) is connected to the discharge pipe of the distillation unit (111), the top of the second stirring tank (112) is connected to the antioxidant feed pipe (108), and the discharge pipe at the bottom of the second stirring tank (112) discharges the finished product cresol.

2. The continuous treatment system for low-temperature cresols in coal gasification according to claim 1, characterized in that: The alkali solution storage tank (101) stores liquid alkali solution with a concentration of 15%-30%, the hydrogen peroxide storage tank (103) stores hydrogen peroxide with a concentration of 20%-30%, and the diluted acid storage tank (105) stores acid solution, which is one of phosphoric acid with a concentration of 40%-60%, sulfuric acid with a concentration of 50%-98%, or hydrochloric acid with a concentration of 15%-25%.

3. The continuous treatment system of low-temperature cresols from coal gasification according to claim 2, characterized in that: Nitrogen pipelines (109) are installed inside the first stirring tank (107) and the second stirring tank (112), and the nitrogen pipelines (109) spray nitrogen to all directions.

4. The continuous treatment system of low-temperature cresols in coal gasification according to claim 3, characterized in that: The distillation unit (111) includes a distillation tower and a condenser, wherein the distillation tower and the condenser are connected, the feed end of the distillation tower is connected to the discharge pipe of the first stirring tank (107), and the discharge end of the condenser is connected to the feed end of the second stirring tank (112).

5. A method for continuously treating low-temperature cresols in coal gasification, using the continuous treatment system for low-temperature cresols in coal gasification according to claim 4, characterized in that: The following steps are involved: S1, alkali washing: mixing the cresol raw material with the liquid alkali in the alkali storage tank (101) through a mixer (110) and then transporting the mixture to an alkali settling tank (102), and removing sulfides in the cresol through alkali washing in the alkali settling tank (102); S2, oxidative deodorization: the cresol after alkali washing is mixed with hydrogen peroxide in the hydrogen peroxide storage tank (103) through a mixer (110), and then transported to an oxidant settling tank (104) for reaction to remove the odor in the cresol, while the generated disulfide remains in the cresol; S3, decolorization and deodorization: the oxidatively deodorized cresol is mixed with the acid solution in the dilute acid storage tank (105) through a mixer (110), and then transported to a decolorization and deodorization sedimentation tank (106) for reaction to remove nitrogen oxides in the cresol; S4, anti-oxidation: transporting the decolorized and deodorized cresol into a first stirring tank (107), adding an antioxidant into the first stirring tank (107) through an antioxidant feeding pipe (108), uniformly mixing the cresols through a stirring device, introducing nitrogen into the first stirring tank (107) through a nitrogen pipe (109) during stirring, and obtaining a refined cresol raw material after stirring; S5, distillation: the anti-oxidized cresol refined raw material is sequentially passed through a distillation tower and a condenser to achieve the effect of passivating the cresol; S6. Improving performance: The distilled cresol is transported into a second stirring tank (112), and an antioxidant is added into the second stirring tank (112) through an antioxidant feeding pipe (108). The mixture is uniformly mixed by a stirring device. During stirring, nitrogen is introduced into the second stirring tank (112) through a nitrogen pipe (109). After stirring, a cresol finished product is obtained.

6. The method for continuously treating low-temperature cresols in coal gasification according to claim 5, characterized in that: The antioxidants added in the S4 antioxidant step are, in sequence, a saturated aqueous solution of aluminum sulfate (or copper sulfate), a 3:2 aqueous solution of a mixture of triammine phosphate and ethylenediaminetetraacetic acid, a 3:2 aqueous solution of sodium hypophosphite and 1,2-propylenediaminetetraacetic acid, and an antioxidant ZQ24, wherein the saturated aqueous solution of aluminum sulfate (or copper sulfate) is 500-2000PPM of the amount added to the cresol; the 3:2 aqueous solution of a mixture of triammine phosphate and ethylenediaminetetraacetic acid is 50-300PPM of the amount added to the cresol; the 3:2 aqueous solution of sodium hypophosphite and 1,2-propylenediaminetetraacetic acid is 50-300PPM of the amount added to the cresol; and the antioxidant ZQ24 is 100-500PPM of the amount added to the cresol.

7. The method for continuously treating low-temperature cresols in coal gasification according to claim 5, characterized in that: The antioxidants added in the S6 performance improvement step are dimethyl ketoxime (or hydrazine hydrate or carbohydrazide) and antioxidant ZQ76, wherein the amount of dimethyl ketoxime (or hydrazine hydrate or carbohydrazide) added is 50-500PPM of the amount of cresol added; the amount of antioxidant ZQ76 added is 100-500PPM of the amount of cresol added.

8. The method for continuously treating low-temperature cresols in coal gasification according to claim 5, characterized in that: The amount of liquid alkali solution added in the alkali washing step S1 is 0.5%-3% of the amount of cresol used, and the temperature during mixing in the alkali solution settling tank (102) is 40°C-60°C.

9. The method for continuously treating low-temperature cresols in coal gasification according to claim 5, characterized in that: In the S2 oxidation deodorization step, the amount of hydrogen peroxide added is 0.5-3% of the cresol, and the temperature during mixing in the oxidant settling tank (104) is 40°C-60°C.

10. The method for continuously treating low-temperature cresols in coal gasification according to claim 5, characterized in that: The amount of acid added in the S3 decolorization and deodorization step is 0.5-3% of the cresol, and the temperature during mixing in the decolorization and deodorization sedimentation tank (106) is 50°C-60°C.

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