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

Hydroxypropyl methylcellulose solvent recovery method

A technology of hydroxypropyl methylcellulose and recycling methods, which is applied in the field of fine chemicals, can solve the problems of long production cycle and high energy consumption, and achieve the effect of short production cycle and low energy consumption

Inactive Publication Date: 2019-02-15
HERCULES TIANPU CHEM
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a hydroxypropyl methyl cellulose solvent recovery method to overcome the problems of high energy consumption and long production cycle in the solvent recovery mode existing in the prior art

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] After the etherification reaction, the temperature of the material (the brand name of the hydroxypropyl methylcellulose product is HK100000S) is 88°C, and after cooling to 75°C, it is transferred to the desolventization kettle (the volume of the desolventization kettle is 20m 3 , the total amount of solvent is 7m 3 ), add 2000L hot water (temperature 75 ℃), let stand for 20 minutes to realize stratification. Turn on the pump to extract the solvent, and observe the solvent state at the glass sight glass. The solvent is clear and transparent without cellulose. After 20 minutes, the extractable part of the solvent has been extracted, and the pipeline is rinsed with hot water at 95°C for 2 minutes. Use steam to distill and recover the remaining part of the solvent, and the required time is about 20 minutes.

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 discloses a hydroxypropyl methylcellulose solvent recovery method, which comprises the following steps: (1) cooling materials, comprising the hydroxypropyl methylcellulose, water and a solvent, subjected to etherification reaction for producing hydroxypropyl methylcellulose, and putting the materials into a solvent removing kettle; (2) supplementing heated water into the solvent removing kettle, and stewing the materials in the solvent removing kettle to achieve stratification; (3) switching on a solvent pump to extract the solvent of the top layer; (4) observing whether the extracted solvent contains the hydroxypropyl methylcellulose, and if hydroxypropyl methylcellulose is contained, returning the extracted solvent to the solvent removing kettle through a circulation pipeline, and if hydroxypropyl methylcellulose is not included, cooling the extracted solvent, and putting the solvent into a solvent recovery system. The hydroxypropyl methylcellulose solvent recovery method disclosed by the invention has short production period and low energy consumption.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to a method for recovering a hydroxypropyl methylcellulose solvent. Background technique [0002] Hydroxypropyl methylcellulose is a nonionic cellulose mixed ether. It is a semi-synthetic, inactive, viscoelastic polymer that is often used as a lubricant in ophthalmology, or as an excipient or excipient in oral medicine, and is commonly found in various commercial products. As a food additive, hydroxypropyl methylcellulose can play the following roles: emulsifier, thickener, suspending agent and substitute for animal gelatin. [0003] At present, the production process of hydroxypropyl methylcellulose in China is mainly the solvent method. The solvent is a mixture of toluene and isopropanol, the solvent does not participate in the chemical reaction, and only provides the required homogeneous reaction conditions for the etherification reaction. After the reaction is comple...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/02C08L1/26
CPCC08J11/02C08J2301/26
Inventor 刘宇杨乾坤汪宇杜文龙肖伟丽
Owner HERCULES TIANPU CHEM