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A New Process for Reducing Formaldehyde Consumption in Neopentyl Glycol Production

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

Active Publication Date: 2015-09-30
大庆三聚能源净化有限公司
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  • 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

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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 for reducing formaldehyde consumption in the production of neopentyl glycol. In a 5000L enamel (or stainless steel) condensation reaction kettle, 2% to 5% is put in to recover 2000 to 3000L of dilute formaldehyde, and the dilute formaldehyde feed is turned off after adding dilute formaldehyde. 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, pass cooling water to the jacket of the condensation reaction kettle and the cooling coil, start stirring and add 37% formaldehyde Make the total amount of formaldehyde including the formaldehyde in the dilute formaldehyde in the condensation reaction kettle to be 28Kmol, then add 8Kmol of 97-98% isobutyraldehyde, open the alkali adding valve at normal temperature of 15~25 ℃, add 30% of the total amount of NaOH solution. Half of 4.2Kmol, the speed of adding alkali should be...

Embodiment 3

[0034] A new process for reducing formaldehyde consumption in the production of neopentyl glycol. In a 5000L enamel (or stainless steel) condensation reaction kettle, 2000-3000L of dilute formaldehyde recovered by 2% to 5% is put into it, and the dilute formaldehyde is turned off after adding the 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 and feeding amount of dilute formaldehyde, pass cooling water to the jacket of the reactor and the cooling coil, start stirring and add 37% formaldehyde Make the total amount of formaldehyde including the formaldehyde in the dilute formaldehyde in the condensation reaction kettle to be 20Kmol, then add 8Kmol of 97-98% isobutyraldehyde, open the alkali adding valve at normal temperature of 15~25 ℃, add 30% of the total amount of NaOH solution. Half of 4.04Kmol, the speed of adding alkali should be adjusted accor...

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PUM

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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 present invention involves a method of production of new pentaol, especially a new process to reduce the consumption of formaldehyde consumption in the production of new pentaol. Background technique [0002] At present, there are two techniques for the production of neohopodiol: [0003] 1. Hydrogenation method [0004] The principle of reaction: [0005] Reproduction 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] The synthesis reaction is under the presence of aminerine catalyst, which reacts with formaldehyde and formaldehyde solution to obtain a mixture containing hydroxytaldehyde alcoholin complication products.Alcohol hydride products are mixture, and then distilled to obtain new pentaol. [0010] The hydrogenation process has high purity of neoosylol, and the stability of the product at high temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(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
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