Method for preparing pentaerythritol stearate (PETS) by using illegal cooking oil

A technology of pentaerythritol stearate and gutter oil, which is applied in the field of oleochemical industry, can solve the problems of increasing the production cost of pentaerythritol stearate, lack of pre-treatment and fine separation process steps, and not being able to meet the requirements of pentaerythritol stearate. The effect of solving social pollution problems, reducing raw material costs, and huge social and economic benefits

Inactive Publication Date: 2013-04-03
QIHE COUNTY QIXIANG BIOLOGICAL SCI & TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for producing pentaerythritol stearate (PETS) by using waste oil, so as to solve the lack of pre-treatment and fine separation process steps in the prior art, which cannot satisfy the production of pentaerythritol stearate with waste oil as raw ma

Method used

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  • Method for preparing pentaerythritol stearate (PETS) by using illegal cooking oil

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] 1. Pre-treatment:

[0026] A. Freezing: freezing the raw materials of the waste oil in a freezer, at a freezing temperature of –5°C, for 3 hours;

[0027] B. Filtration: filter the frozen waste oil raw materials to obtain crystalline A and non-crystalline B products;

[0028] 2. Hydrolysis:

[0029] The A and B products obtained in step 1 are respectively hydrolyzed by physical hydrolysis, the hydrolysis pressure is 2.0MPa, the hydrolysis temperature is 250°C, and the time is 8 hours; after the hydrolysis, the A and B products become crude acids C and D correspondingly;

[0030] 3. Distillation:

[0031] The crude acid C and D obtained in step 2 are respectively distilled under negative pressure in a still at a temperature of 220°C, and the degree of vacuum under negative pressure is negatively correlated with temperature;

[0032] 4. Rough score:

[0033] The product of step 3 is crudely separated in a fractionation tower, the temperature is 230℃; the pressure is ...

Example Embodiment

[0040] Example 2

[0041] 1. Pre-treatment:

[0042] A. Freezing: freezing the raw oil of the waste oil in a freezer, at a freezing temperature of –15°C for 2 hours;

[0043] B. Filtration: Filter the frozen waste oil raw materials to obtain crystalline A and non-crystalline B products;

[0044] 2. Hydrolysis:

[0045] The A and B products obtained in step 1 are respectively hydrolyzed by physical hydrolysis, the hydrolysis pressure is 2.5MPa, the hydrolysis temperature is 220°C, and the time is 10 hours; after the hydrolysis, the A and B products become crude acids C and D accordingly;

[0046] 3. Distillation:

[0047] The crude acid C and D obtained in step 2 are respectively distilled under negative pressure in a still at a temperature of 240°C, and the degree of vacuum under negative pressure is negatively correlated with temperature;

[0048] 4. Rough score:

[0049] The product of step 3 is crudely separated in a fractionation tower with a temperature of 240°C and a pressure of 0.095...

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Abstract

The invention relates to a method for preparing pentaerythritol stearate (PETS) by using illegal cooking oil and belongs to the technical field of oleochemical industry. According to the preparation method, the illegal cooking oil is used as a main raw material, aiming at the characteristics of complex raw material components of the illegal cooking oil, the process steps of earlier stage treatment and fine fractionating are added, the process steps of distillation and synthesis are improved to obtain pentaerythritol stearate with high purity, and other byproducts, such as crude acids and glycerol. The preparation method comprises the following process steps of: 1, earlier stage pretreatment; 2, hydrolysis; 3, distillation; 4, crude fractionating; 5, fine fractionating; 6, synthesizing; and 7, tabletting. The waste of the illegal cooking oil in the catering industry is fully utilized and is turned into wealth, the problem of social public hazards that the illegal cooking oil is used for cooking meals is solved, and the environmental pollution caused by abandoned illegal cooking oils is avoided. Since a matched process method for preparing pentaerythritol stearate by using the illegal cooking oil as the raw material is provided, the cost of the raw material is reduced by more than 50%, a lot of foreign exchanges for importing raw materials are saved, the production cost is reduced, and the process method has broad market prospect and great social and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of oil chemical industry Background technique [0002] Waste oil is a waste product of the catering industry, and it covers a large area. At present, there are no good waste utilization channels at home and abroad, resulting in the waste of a large amount of waste oil, causing serious environmental pollution. Some unscrupulous traders use the produced waste oil as food. Oil is served on the dining table, or used as edible oil raw material to produce various foods, which brings great harm to people's health. How to digest and process waste oil and turn waste into treasure has formed a serious social problem. [0003] Pentaerythritol stearate is a chemical raw material for high-grade plastics and rubber. At present, the conventional raw material for obtaining pentaerythritol stearate at home and abroad is palm oil. First, stearic acid is produced from palm oil, and then pentaerythritol stearic acid is synthesi...

Claims

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Application Information

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IPC IPC(8): C07C69/33C07C67/08C07C51/09C07C57/12
Inventor 白秀民李洪跃陈金庆
Owner QIHE COUNTY QIXIANG BIOLOGICAL SCI & TECH
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