Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Novel process for reducing consumption of formaldehyde in production of neopentyl glycol

A new technology of neopentyl glycol and new process is applied in the new process field of reducing formaldehyde consumption in the production of neopentyl glycol, which can solve the problems of poor quality hydrogenation method, low price, poor high temperature thermal stability, etc. Response, the effect of reducing consumption

Active Publication Date: 2013-04-03
大庆三聚能源净化有限公司
View PDF1 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The sodium formate method overcomes the shortcomings of the large investment of the hydrogenation method, but the quality is worse than the hydrogenation method, and the price is lower, especially the high temperature thermal stability is still worse than the hydrogenation method

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] A new process for reducing formaldehyde consumption in the production of neopentyl glycol. Add 2000-3000L of water to the 5000L enamel (or stainless steel) condensation reaction kettle, feed cooling water into the reactor jacket and cooling coil, start stirring and add 37% Formaldehyde 24Kmol, then add 97-98% isobutyraldehyde 8Kmol, open the alkali addition valve at 15-25°C at room temperature, add half of the total amount of 30% NaOH solution 4.12Kmol, the speed of alkali addition should be adjusted according to the temperature of the kettle, When adding alkali, the temperature in the kettle is controlled at 30-35°C, pH9-11, and the time is 2 hours. The temperature in the condensation reactor rises rapidly, exceeding the allowable temperature range, which is not conducive to the condensation reaction, and easily causes the disproportionation reaction of formaldehyde, which increases the consumption of formaldehyde; Alcohol, the hydroxyl value of the image product); the...

Embodiment 2

[0031]A new process to reduce the consumption of formaldehyde in the production of neopentyl glycol. In a 5000L enamel (or stainless steel) condensation reaction kettle, put 2% to 5% to recover 2000 to 3000L of dilute formaldehyde, and close the feed of dilute formaldehyde after adding dilute formaldehyde Valve, measure the content of dilute formaldehyde in the condensation reactor, calculate the feeding amount of 37% formaldehyde according to the content of dilute formaldehyde and the feeding amount, feed cooling water into the jacket of the condensation reactor and the cooling coil, start stirring and add 37% formaldehyde Make the total amount of formaldehyde in the condensation reactor, including formaldehyde in dilute formaldehyde, be 28Kmol, then add 8Kmol of 97-98% isobutyraldehyde, open the alkali addition valve at 15-25°C, and add 30% of the total amount of NaOH solution Half of 4.2Kmol, the speed of adding alkali should be adjusted according to the temperature of the k...

Embodiment 3

[0034] A new process to reduce formaldehyde consumption in the production of neopentyl glycol. In a 5000L enamel (or stainless steel) condensation reaction kettle, put 2000~3000L of 2%~5% recovered dilute formaldehyde, and close the dilute formaldehyde inlet after adding dilute formaldehyde. Feed valve, measure the content of dilute formaldehyde in the condensation kettle, calculate the feeding amount of 37% formaldehyde according to the content of dilute formaldehyde and the feeding amount, feed cooling water into the reactor jacket and cooling coil, start stirring and add 37% formaldehyde Make the total amount of formaldehyde in the condensation reactor, including formaldehyde in dilute formaldehyde, be 20Kmol, then add 8Kmol of 97-98% isobutyraldehyde, open the valve for adding alkali at 15-25°C, and add 30% of the total amount of NaOH solution Half of 4.04Kmol, the speed of adding alkali should be adjusted according to the temperature of the kettle. When adding alkali, the ...

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 provides a novel process for reducing the consumption of formaldehyde in the production of neopentyl glycol, comprising the following steps of: adding recycled diluted formaldehyde into a condensation kettle; starting agitating, and adding formaldehyde with the concentration of 37% to enable formaldehyde total amount in the condensation kettle to be 24 Kmol; adding 8 Kmol of isobutyraldehyde with the concentration of 97-98% and adding 4.12 Kmol of an NaOH solution with the concentration of 30%, which is one half of the total amount, at a room temperature; controlling the temperature in the kettle to 30-35 DEG C, the pH to 9-11 and the time to 2 hours in a process of adding alkali; then, improving the pH to 12-13 and adding the residual half of 4.12 Kmol of the NaOH solution with the concentration of 30% at a constant speed; controlling the temperature of the system to 40-45 DEG C and controlling time to 2 hours; raising the temperature to 45-50 DEG C and keeping for 3-4 hours; adding formic acid to neutralize a condensed solution until the pH is 7-8; recycling superfluous formaldehyde in a condensation reaction by pressurized distilling; and dehydrating an aldehyde removing solution from an aldehyde removing tower and carrying out pre-fractionation, rectification and flaking to obtain a neopentyl glycol finished product. According to the novel process provided by the invention, the utilization rate of formaldehyde in a production process of neopentyl glycol is improved, the quality of neopentyl glycol is improved and the consumption of sodium hydroxide is reduced.

Description

technical field [0001] The invention relates to a method for producing neopentyl glycol, in particular to a new process for reducing formaldehyde consumption in the production of neopentyl glycol. Background technique [0002] There are currently two processes for producing neopentyl glycol: [0003] 1. Hydrogenation method [0004] Reaction principle: [0005] Condensation reaction: [0006] CH 3 (CH 3 )CHCHO+HCHO→CH 3 (CH 3 )C(CH 2 OH) CHO [0007] Hydrogenation reaction: [0008] CH 3 (CH 3 )C(CH 2 OH) CHO+H 2 →CH 3 (CH 3 )C(CH 2 Oh) 2 [0009] In the condensation reaction, in the presence of a tertiary alkylamine catalyst, isobutyraldehyde is reacted with an aqueous formaldehyde solution to obtain a mixture of aldol condensation products containing hydroxypivalaldehyde; in the hydrogenation reaction, in the presence of a nickel catalyst, a mixture containing neopentyl di Alcohol hydrogenation product mixture, and then distilled to obtain neopentyl gl...

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): C07C27/00C07C31/20C07C29/14
Inventor 张少华
Owner 大庆三聚能源净化有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com