Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for recovering glycerin in production of pentanediol

A recovery method, pentylene glycol technology, applied in 2 fields, can solve the problems of long time consumption, environmental pollution, insufficient recycling of glycerin, etc., and achieve the effect of reducing production costs and preventing environmental pollution

Inactive Publication Date: 2010-02-17
淄博德丰化工有限公司
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydroboration reduction of 2,4-pentanedione to 2,4-pentanediol, because 2,4-pentanediol is miscible with water, solvent extraction requires multiple extractions, consumes a large amount of solvent, and takes a long time
There are mainly unreacted glycerol and glycerol borate in the raffinate, and the existence of a large amount of raffinate affects the production of 2,4-pentanediol
Glycerin in the form of glycerol borate, if directly discarded, will cause environmental pollution, and glycerol has not been fully recycled, resulting in an increase in the cost of producing pentylene glycol

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for recovering glycerin in production of pentanediol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 86g KBH to the 2000ml reaction bottle 4 , 660mL H 2 O. 160mL of methanol, stirring and cooling down to 0°C, dropwise adding a mixture of 240g of 2,4-pentanedione and 160g of methanol at a temperature below 20°C, and reacting at room temperature for 2 hours after the addition is complete; distill out the methanol under reduced pressure and water, and then 1000 g of glycerin was added; fractional distillation obtained 234 g of the product 2,4-pentanediol with a content of 98.3% and a yield of 92.1%. Add H to the remaining raffinate 2 O 1000ml and after stirring and mixing, add 150g of 98% concentrated sulfuric acid to make the pH of the reaction solution 4.0, and stir and react at 50°C for 2 hours, then cool down to 0-5°C, crystallize out, filter, and concentrate the filtrate to remove water. Recover glycerin 850g.

Embodiment 2

[0031] Glycerol 847g is recovered in the same manner as in Example 1, the only difference is that the material used in Example 2 is: the combination of 850g of glycerol recovered in Example 1 and fresh glycerin 150g, adding 30% concentrated hydrochloric acid to make the pH of the reaction solution: 4.0. Among them, 95.3 g of 2,4-pentanediol was obtained with a content of 99.87%.

Embodiment 3

[0033] Glycerin 835g was recovered in the same manner as in Example 1, except that the material used in Example 3 was a combination of 847g of glycerol recovered in Example 2 and 153g of fresh glycerin, and acetic acid was added to make the pH of the reaction solution 4.0. Among them, 93.0 g of 2,4-pentanediol was obtained, with a content of 100%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for recovering glycerin in production of pentanediol, which comprises the following steps: catalyzing and hydrolyzing glyceryl borate with acid after the pentanediolis collected by distillation; cooling and crystallizing; separating boric acid, and recovering the glycerin. The invention solves the problem of recovery of the glycerin in residue after the product is distilled in the production of the pentanediol, lowers the production cost and reduces the pollution to the environment.

Description

technical field [0001] The invention relates to a recovery method of glycerol in the process of reducing ketone or aldehyde to alcohol, in particular to a recovery method of glycerol in the production of pentanediol, especially a recovery method of glycerin in the production of 2,4-pentanediol. Background technique [0002] Pentylene glycol is an important chemical raw material. Chinese patent CN1226259C discloses a method for preparing 1,2-glutaraldehyde by using n-pentene, formic acid and hydrogen peroxide as raw materials. Chinese patent application publication CN101270032A discloses a method for preparing 1,2-pentanediol by hydrogenating 1,5-pentanediol. Chinese patent CN100451088C discloses a method for preparing biodiesel, which involves recovery of glycerin. [0003] In addition, pentylene glycol dibenzoate is a propylene catalyst intermediate, and the preparation process of pentylene glycol dibenzoate is as follows: [0004] [0005] Wherein, the preparation of...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C07C31/22C07C29/12C07C31/20
Inventor 颜如和卞晓红
Owner 淄博德丰化工有限公司