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Soap stock recycling pollution-free process

A pollution-free and resource-based technology, applied in the non-pollution process of soapstock resource utilization, can solve problems such as high sulfur content in products, high impurity content in acidified oil, and unsolved problems such as wastewater treatment or resource utilization of sulfate radicals, and achieve production The process is safe and reliable, and the effect of high effective content

Inactive Publication Date: 2021-09-28
青岛碧沃德生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The main product acidified oil has high impurity content: the effective substances (esterified substances) of acidified oil are free fatty acids and glycerides. Due to the use of sulfuric acid for acidification, side reactions occur at the same time as acidification, resulting in oil polymerization, oxidation, and coking, resulting in acidification The effective content of oil products is reduced, and the actual test shows that the effective content is generally not more than 80% (W)
[0005] 2. High sulfur content in the product: Due to the use of sulfuric acid, the sulfonation reaction of oil and fatty acid is caused during the reaction, resulting in a high sulfur content in the product, generally above 500mg / kg
[0006] 3. High phospholipid content: sulfuric acid is a strong acid, so its ability to neutralize soap is unquestionable, but because it is an inorganic acid, it has poor compatibility with oils, so it has little effect on phospholipids and cannot promote the hydrolysis of phospholipids. Therefore, acidified oils contain hundreds of Graded content of phospholipids (about 3%) is unfavorable for subsequent reactions
[0007] 4. Acid-containing wastewater is difficult to treat: sulfate is a pollutant that is almost helpless in the existing sewage treatment process. With the increasingly stringent environmental protection policies in my country, the sewage of acidified oil by traditional sulfuric acid method has become an insurmountable obstacle in the acidified oil industry. The acidified oil project is also for this reason
[0014] Some other prior art schemes such as the patent application for CN104450204A requesting protection of a "clean production process for simultaneously extracting gossypol and fatty acid from cotton oil soapstock", and CN108348856 requesting protection of a "mixed lipid raw material or soapstock to prepare free fatty acids and fatty acid derivatives” patent application, the publication number is CN105925380A, and the patent application for “a new method for producing acidified oil by pressure reaction of soapstock or / and oil foot” is requested, and the publication number is CN109554230A The patent application for protection of "a method for preparing acidified oil by using soapstock", etc., the core content of which is basically some optimization based on the sulfuric acid acidification process, but none of them solve the problem of treatment or resource utilization of wastewater containing sulfate radicals

Method used

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Experimental program
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Effect test

Embodiment 1

[0046] A kind of soapstock recycling pollution-free process of the present embodiment, soapstock is detected, and the oil content is determined to be 40%, the acidified oleic acid value is 80mgKOH / g, and the saponification value is 195mgKOH / g, and 13 tons of soapstock after detection are weighed Pump into a 20m³ glass-lined reactor, and then start to stir and heat slowly. While stirring and heating, slowly pump 0.40 tons of acetic acid through a flow meter to perform acidification once, let it stand for stratification, and add 0.28 tons of polyferric sulfate to the lower layer. When it reaches above 80°C, start timing, continue to stir and heat, and stir for 2 hours at a temperature of 80°C-180°C. The upper layer has an acidified oleic acid value of 80mgKOH / g and a saponification value of 195mgKOH / g. It is used as a raw material for biodiesel, and the lower layer is an aqueous solution. After static precipitation, filter with a plate-and-frame filter, use the filter cake as pho...

Embodiment 2

[0049] A kind of soapstock recycling pollution-free process of the present embodiment, soapstock is detected, and the amount of soap content and the amount of acid added are determined, and 13 tons of soapstock after detection are weighed and pumped into a 20m³ glass-lined reaction kettle, and stirring and Heating; Weigh 0.8 tons of oxalic acid and dissolve it with 2 tons of evaporated recovery water, slowly pump it into the reaction kettle and mix it with soapstock, carry out acidification once, stir and heat until the temperature reaches 80°C, start timing, and stir at 80°C-120°C for 2 Hours, after standing still, release the aqueous solution of the lower layer; add 0.1 tons of oxalic acid to the upper layer of oil layer to repeat the acidification operation for secondary acidification, stand to separate the aqueous solution of the lower layer, and mix it with the aqueous solution of the lower layer obtained from the first acidification to obtain a mixed aqueous solution, whic...

Embodiment 3

[0053] A kind of soapstock recycling pollution-free process of the present embodiment, soapstock is detected, and the amount of soap content and the amount of acid added are determined, and 13 tons of soapstock after detection are weighed and pumped into a 20m³ glass-lined reaction kettle, and stirring and Heating, slowly pumping 0.40 tons of acetic acid through the flow meter, performing acidification once, heating and stirring, and starting timing when the temperature reaches 80°C, stirring for 2 hours at a temperature of 80°C-120°C, then standing still, releasing the lower aqueous solution; then adding Repeat the first acidification operation with 0.05 tons of formic acid for the second acidification, let stand to separate the lower layer aqueous solution, mix with the lower layer aqueous solution obtained from the first acidification, and obtain a mixed aqueous solution. The concentration of sodium acetate+sodium formate in the aqueous solution is about 7.60%, and glycerin i...

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Abstract

The invention discloses a soap stock recycling pollution-free process. Micromolecular organic acid reacts with soap stock to generate acidified oil, organic acid salt, trace glycerol and water. The upper-layer acidified oil is used as biodiesel and other oleaginous chemical raw materials, the lower-layer organic acid salt, trace glycerol and water mixed liquid is directly or properly concentrated to be used as a sewage treatment carbon source, recycling of all main and by-products is achieved, the reaction is carried out at normal temperature and normal pressure, and the production process is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of soapstock recycling, and in particular relates to a pollution-free process for recycling soapstock. Background technique [0002] Soapstock is the sediment after alkali refining (GB / T 8873-2008), and it is the largest by-product of oil refining. The national soapstock output is about 2.4 million tons, of which about 1 million tons of active ingredients. [0003] Soapstock is mainly a mixture of fatty acid sodium (potassium), neutral oil (30-45%) and water (55-70%), which is a valuable oil resource. The first step in the resource utilization of soapstock is to acidify and break the emulsion Realize the separation of oil and water to obtain acidified oil. The traditional process mainly uses sulfuric acid. The soapstock is acidified by adding sulfuric acid to obtain a mixture of free fatty acid and neutral oil in the upper layer and a mixture of sodium sulfate in the lower layer and waste water containing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/66C02F1/40C02F1/001
Inventor 宁雪楠辛华鹏徐刚
Owner 青岛碧沃德生物科技有限公司