Method for preparing fatty acid by using waste oil and fat

A technology for waste oils and fatty acids, applied in the field of fine chemical preparation, can solve the problems of restricting production efficiency, difficult to meet environmental protection standards, and increasing production costs, so as to improve the processing difficulty and processing cost, reduce the amount of acid and alkali salts, and solve the problem of easy The effect of slag clogging

Inactive Publication Date: 2013-08-07
彭敏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method of using waste oil to prepare fatty acids still has more or less defects: one is that the mesh screen in the distillation tower is prone to slagging and clogging, requiring frequent shutdowns for maintenance, which restricts the improvement of production efficiency
The second is to use liquid acid as a catalyst, the equipment is severely corroded, and the amount of waste water is large, so it is difficult to meet environmental protection standards
The third is that a large amount of brine must be used to flush the clogged sieve of the distillation column, resulting in secondary pollution and consumption of raw materials, and the production cost is greatly increased
Fourth, due to slagging and uneven catalysis, the reaction yield and product quality are not high
The fifth is that the post-processing of the preparation process requires a lot of labor costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Mix Trichoderma longifolia, cellulase, amylase and other compound liquid enzymes in a ratio of 1:1:1, and shear at high speed for 20 minutes at normal temperature and pressure; the sheared compound liquid enzymes, waste oil and The co-solvent was mixed at a ratio of 0.5:80:20, and the mixture was fully stirred, and enzymatically hydrolyzed at 50°C for 50min. Add a solid acid catalyst with a mass ratio of 0.2% to the enzymolysis solution for catalytic decomposition for 240 minutes, and control the temperature at 150°C;

[0021] The catalytic decomposition product was left to stand for 30 minutes, oil and water were separated, and the solid acid catalyst was recovered by pressure filtration of the oil phase, and then fatty acid and oleic acid were obtained by vacuum multi-tower continuous rectification. The rectification conditions are that the bottom temperature of the rectification tower is 230°C, and the vacuum degree in the tower is -0.025Mpa; the discharged water pha...

Embodiment 2-5

[0024] Process steps are the same as in Example 1, and process control parameters and product quality are shown in Table 1 and Table 2.

[0025] Table 1, embodiment 1-5 process control parameter

[0026] .

[0027] Table 2, embodiment 1-5 product quality one Kam table

[0028] .

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Abstract

The invention relates to a method for preparing fatty acid by using waste oil and fat. The method comprises the steps of firstly, mixing one or at least two of trichoderma longibrachiatum, cellulose and amylase to obtain composite liquid mucedine and performing high-speed shearing under normal pressure and temperature; secondly, mixing the sheared composite liquid mucedine with the waste oil and fat and cosolvent according to a certain proportion, stirring the mixture fully and performing enzymolysis; thirdly, adding a certain amount of solid acid catalyst to a enzymolysis solution to performcatalytic decomposition; and fourthly, subjecting the catalytic decomposer to oil-water separation and obtaining the fatty acid and oleic acid through vacuum multi-tower continuous distillation separation after oil phase filter pressing and recycling of solid acid catalyst, so that the discharge water phase is waste water, the water enters a waste water processing system and a discharging standard is met. According to the method, the cost of the raw material is low, the process is simple, the operation is convenient, the total yield rate of the fatty acid after acidification is high, the problems of slag-bonding and blocking of halftone screens inside a tower and acid-base pollution, the production efficiency is improved, the raw material consumption is reduced, the waste water processingdifficulty is improved, and the environment is protected effectively.

Description

technical field [0001] The invention relates to the technical field of fine chemical preparation, in particular to a method for preparing fatty acid from waste oil. Background technique [0002] Every year, there are no less than 5 million tons of waste oil in the country, which is not used, causing serious environmental pollution and clogging sewers. What's more, criminals actually use the waste oil and hog oil produced by local methods as edible oil to flow into the dining table and food industry , causing endless harm. For this reason, relevant countries in the world have legislated one after another to establish a complete set of systems for waste oil collection, transportation, storage, processing, and sales, and provide preferential support from tax policies. Among them, Japan has increased investment in this area due to natural resource constraints and obtained It has achieved very good results and ranks at the leading level in the world. [0003] Fatty acids are ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11C1/10C11C1/06
Inventor 彭敏潘启发彭正贤
Owner 彭敏
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