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Process for refining waste oil

A waste oil and process technology, applied in the field of waste oil refining process, can solve the problems of complex sewage treatment process, serious environmental pollution, equipment corrosion damage, etc., and achieve the effect of reducing energy consumption, solving environmental pollution problems, and reducing corrosion

Inactive Publication Date: 2012-06-20
JIANGSU HENGSHUNDA BIO ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional oil refining process mainly utilizes various physical and chemical properties of various impurity components in waste oil, and adopts corresponding physical and chemical means to deal with them. These methods can effectively remove most of the impurities in conventional animal and vegetable oils with relatively stable components. Some mechanical impurities, water-soluble gums and fat-soluble gums, but for waste oils, due to their unstable sources, especially waste oils contain a considerable amount of phospholipids, proteins, mucus, glycosyl diglycerides, etc. Impurities and unsaponifiable substances such as aliphatic polymers and complex metal salts are difficult to be effectively refined by traditional methods
Moreover, in the traditional oil refining process, on the one hand, due to the complexity of waste oil, there are many kinds of chemical additives, and a large amount of strong acid and alkali are used to cause serious corrosion damage to the equipment; , the large amount of sewage produced is complex, the environment is seriously polluted, the whole oil refining process is long, and the energy consumption is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Magnesium sulfate and benzalkonium chloride are mixed into an aqueous solution with a mass concentration of 0.1% in a volume ratio of 1:1, and magnesium sulfate and benzene that are 2% to 3% of the waste oil quality are added to the waste oil to be refined. The ammonium chloride mixed aqueous solution is fully mixed and then enters the heat preservation settling tank, and is heated to 85°C, heats it for 2 hours, then separates and removes the lower water phase and impurities, and the upper oil phase mixture is heated to 135°C by the heat exchanger and then continuously enters the electric dehydration tank . The pressure of the electric dehydration tank is 1.5MPa, the high-voltage electric field strength is 1.6KV / cm, and the residence time is 3min. The dehydrated upper oil phase mixture continuously enters the self-cleaning heater and heats up to 228°C, the residence time is 3min, and then enters the horizontal screw centrifuge to separate and remove glue impu...

Embodiment 2

[0021] Example 2: Sodium chloride and triethanolamine are mixed into an aqueous solution with a mass concentration of 0.5% in a volume ratio of 1:0.2, and sodium chloride and triethanol that are 2% to 3% of the waste oil quality are added to the waste oil to be refined. The ethanolamine mixed aqueous solution is fully mixed and then enters the heat preservation settling tank, and is heated to 90°C, heats it for 2.5 hours, and then separates and removes the lower water phase and impurities. The pressure of the electric dehydration tank is 1.6MPa, the high-voltage electric field strength is 1.8KV / cm, and the residence time is 4min. The dehydrated upper oil phase mixture continuously enters the self-cleaning heater and heats up to 245°C, the residence time is 2min, and then enters the horizontal screw centrifuge to separate and remove glue impurities to obtain refined waste oil. After the above refining process, the indicators of waste oil changed as follows: acetone insoluble ma...

Embodiment 3

[0022] Embodiment 3: Sodium chloride, dimethyl sulfate and imidazoline are mixed into the aqueous solution that mass concentration is 0.05% by volume ratio 1: 0.1: 0.1, add in the waste oil and fat to be treated as waste oil quality 2%~ 3% mixed aqueous solution of sodium chloride, dimethyl sulfate and imidazoline, fully mixed, enter the heat preservation settling tank, and raise the temperature to 80 ℃, keep warm for 3 hours, then separate and remove the lower water phase and impurities, and the upper oil phase mixture is replaced After heating up to 152°C, the heater continuously enters the electric dehydration tank. The pressure of the electric dehydration tank is 1.38MPa, the high voltage electric field strength is 2.02KV / cm, and the residence time is 3.5min. The dehydrated upper oil phase mixture continuously enters the self-cleaning heater and heats up to 250°C, the residence time is 3min, and then enters the horizontal screw centrifuge to separate and remove glue impuri...

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PUM

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Abstract

The invention discloses a process for refining waste oil. The process comprises the following steps of: performing preliminary separation to remove a water phase and impurities from the lower layer of the waste oil, removing water and a salt substance from an oil phase mixture on the upper layer of the waste oil under the action of a high-voltage electric field, heating at high temperature to damage a glue impurity system, and centrifuging to remove glue impurities. The process has the advantages that: the process of refining the waste oil is shortened while the waste oil meets the esterification production requirement of biodiesel after being refined by the process; strong acid and strong alkali are not used, so that corrosion to reaction equipment is reduced; the using amount of a chemical additive is reduced, steps of washing, vacuum drying and the like are avoided, and the problem of environmental pollution caused by sewage treatment difficulty in the conventional process is solved; the refined high temperature waste oil also can be used as a heat source, heat energy in the whole process is reasonably and efficiently utilized, and energy consumption is reduced; and the quality of the refined waste oil is improved, so that the problems of coking, carbon deposition, equipment blockage and the like which are generated in the process of producing the biodiesel are solved.

Description

technical field [0001] The invention relates to a waste oil refining process. Background technique [0002] With the increasingly tense use of energy in the world, finding various new energy sources that can replace fossil energy sources has become one of the important research tasks of all countries in the world today. Biodiesel has attracted much attention in recent years because of its great advantages in power performance, environmental protection performance and safety performance, and has developed rapidly. [0003] Biodiesel is diesel produced from animal and vegetable oils through transesterification. Biodiesel does not contain sulfur and aromatics. It has a high cetane number and good lubricating properties. It is a high-quality clean diesel. The raw material of biodiesel is mainly waste oil, and the large-scale application of vegetable oil raw materials needs to be further developed. Waste oil refers to animal and vegetable oil that can no longer be eaten, includi...

Claims

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Application Information

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IPC IPC(8): C11B3/00
Inventor 陈恒顺严小建沈建平
Owner JIANGSU HENGSHUNDA BIO ENERGY