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Method for producing glycerol triacetate by using glycerinum as by-product of biodiesel

A technology of triacetin and biodiesel, applied in the field of oleochemical industry, can solve the problems of hindering the industrialization of triacetin, a large amount of acid-containing wastewater, and large acetic anhydride.

Active Publication Date: 2017-08-11
SHANDONG YANHAI CONSTR RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of acetic anhydride consumed by the reaction of this process method is relatively large, resulting in higher production costs of triacetin; in the use of acetic anhydride, a large amount of acid-containing wastewater will be produced, which is unfavorable to the environment; acetic anhydride belongs to precursor preparations, and must To a certain extent, it also hinders the industrialization of triacetin

Method used

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  • Method for producing glycerol triacetate by using glycerinum as by-product of biodiesel
  • Method for producing glycerol triacetate by using glycerinum as by-product of biodiesel
  • Method for producing glycerol triacetate by using glycerinum as by-product of biodiesel

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Effect test

Embodiment 1

[0053] (1) Purification of biodiesel by-product glycerin system:

[0054] The main composition and content of the by-product glycerin system directly obtained in the process of preparing biodiesel from vegetable oil alcoholysis are: glycerin 78.3%, soap 2.6%, fatty acid methyl ester 0.3%, methanol 18.8%;

[0055] Step 1: Pour 5 tons of by-product glycerin liquid directly obtained in the process of preparing biodiesel into the reactor 1, and distill the methanol contained in the system under the conditions of a vacuum of 90kpa and a temperature of 90°C;

[0056] Step 2: Transfer the crude glycerol obtained in step 1 into reactor 2 after steaming methanol, add 480kg of dilute hydrochloric acid with a concentration of 20wt.% in reactor 2, and adjust the pH value of the system to 6.4, which is slightly acidic Under the condition of static stratification, after standing for 6h, the crude glycerin of the lower layer is transferred in the reaction kettle 3, and the fatty acid methyl ...

Embodiment 2

[0066] (1) Purification of biodiesel by-product glycerin system:

[0067] The main composition and content of the by-product glycerin system directly obtained in the process of preparing biodiesel from vegetable oil alcoholysis are: glycerin 76.9%, soap 2.9%, fatty acid methyl ester 0.4%, methanol 19.8%;

[0068] Step 1: Pour 6 tons of the by-product glycerol liquid directly obtained in the process of preparing biodiesel into the reactor 1, and distill the methanol contained in the system under the conditions of a vacuum of 93kpa and a temperature of 88°C;

[0069] Step 2: Transfer the crude glycerol obtained in step 1 into reactor 2 after steaming methanol, add 580kg of dilute hydrochloric acid with a concentration of 20wt.% in reactor 2, and adjust the pH value of the system to 6.6, which is slightly acidic Under the condition of static stratification, after standing for 6h, the crude glycerin of the lower layer is transferred in the reaction kettle 3, and the fatty acid met...

Embodiment 3

[0077] (1) Purification of biodiesel by-product glycerin system:

[0078] The main composition and content of the by-product glycerin system directly obtained in the process of alcoholysis of vegetable oil to prepare biodiesel are: glycerin 77.8%, soap 2.4%, fatty acid methyl ester 0.3%, methanol 19.5%;

[0079] Step 1: Pour 5.5 tons of by-product glycerin liquid directly obtained in the process of preparing biodiesel into reactor 1, and distill methanol contained in the system at a vacuum of 93kpa and a temperature of 89°C;

[0080] Step 2: Transfer the crude glycerin obtained in step 1 into reactor 2, and add 520kg of dilute hydrochloric acid with a concentration of 20wt.% in reactor 2 to adjust the pH value of the system to 6.5, which is slightly acidic Under the condition of static stratification, after standing for 6h, the crude glycerin of the lower layer is transferred in the reaction kettle 3, and the fatty acid methyl ester of the upper layer is discharged;

[0081] ...

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Abstract

The invention provides a method for producing glycerol triacetate by using glycerinum as a by-product of biodiesel. The method comprises the following steps: carrying out transesterification on the glycerinum as the by-product of the biodiesel, an acid catalyst and an organic benzenes water-carrying agent in a reactive distillation column; extracting water generated by reaction from the top of the column; collecting coarse glycerol triacetate from a column reactor; and distilling the coarse glycerol triacetate in the reactive distillation column under reduced pressure to obtain the glycerol triacetate. According to the method, the glycerinum as the by-product of the biodiesel is used as the raw materials to produce the glycerol triacetate, monoglyceride and 1,3-diglyceride can be converted into the glycerol triacetate without use of acetic anhydride, the obtained glycerol triacetate has high yield and purity, the production cost of the glycerol triacetate is reduced, waste acids are reduced, meanwhile, the glycerinum as the by-product of the biodiesel is utilized effectively, and therefore, the problem of excess production capacity of pure glycerinum is solved.

Description

technical field [0001] The invention relates to the technical field of oleochemical industry, in particular to a method for producing glycerol triacetate by utilizing biodiesel by-product glycerin. Background technique [0002] The increasingly serious energy crisis makes the development of renewable energy an inevitable trend in the present and future, and biodiesel is an ideal renewable energy. The by-product glycerol will be produced in the preparation of biodiesel. The by-product glycerol is crude glycerol with low purity. Usually, the by-product glycerol is refined and purified to obtain pure glycerol, which is used as a general chemical reagent. However, with the rapid increase in global biodiesel production As a result of the expansion, the production of its by-product glycerin also increased sharply, which led to the supply of pure glycerin reagents greatly exceeding the market demand, and the contradiction of oversupply was prominent, which has become a bottleneck r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/18C07C67/08C07C67/54
CPCC07C67/08C07C67/54C07C69/18Y02E50/10Y02P20/10
Inventor 孙文娟孙博孟庆森谭德敏
Owner SHANDONG YANHAI CONSTR RESOURCES
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