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Process for preparing neopentyl glycol with calcium method

A technology of neopentyl glycol and process, applied in the field of preparing neopentyl glycol by calcium method, can solve the problems of low price, large investment in hydrogenation process and high product price, and achieve good quality, low price of raw materials and strong market competitiveness. Effect

Inactive Publication Date: 2012-10-03
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the investment in the hydrogenation process is large and the product price is high
[0016] The disproportionation process (formic acid method) overcomes the disadvantage of large investment, 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

[0025] A calcium method to prepare neopentyl glycol, first prepare the amount of various raw materials for each batch, then open the cooling water valve of the reactor, close the bottom discharge valve of the reactor (5000L enamel reactor or stainless steel reactor), According to the calculation of the amount of feed, 1210L of formaldehyde with a concentration of 37% (equivalent to 16.4Kmol of formaldehyde) was used, and the formaldehyde was diluted to 21-23% with 1000L of recovered condensed water, and the stirring was started, and then 740L of 97%-98% isobutyraldehyde (equivalent to isobutyraldehyde) was added. Butyraldehyde 8Kmol), at room temperature (generally 15 ~ 25 ℃), open the alkali adding valve and add 10% calcium hydroxide suspension (equivalent to calcium hydroxide 2.08Kmol), when adding calcium hydroxide suspension, the temperature in the kettle is controlled at 30 ~ 35°C, not higher than 35°C. The speed of adding calcium hydroxide should be adjusted according to ...

Embodiment 2

[0029] A process for preparing neopentyl glycol by the calcium method. Firstly, the amount of various raw materials for each batch is prepared, then the condensation cooling water valve is opened, and the bottom discharge valve of the condensation kettle (5000L enamel reactor or stainless steel reactor) is closed. Calculate the amount of 1253L of 37% formaldehyde (equivalent to 17.0Kmol of formaldehyde), dilute the formaldehyde to 21-23% with 1000L of recovered condensed water, start stirring, and then add 740L of 97%-98% isobutyraldehyde (equivalent to 8Kmol of isobutyraldehyde) , at room temperature (generally 15-25°C), open the valve for adding alkali and add 10% calcium hydroxide suspension (equivalent to calcium hydroxide 2.08Kmol). If the temperature is higher than 35°C, the speed of adding calcium hydroxide should be well controlled during the process of adding calcium hydroxide. The speed of adding calcium hydroxide should not be too fast. 9 to 11, and the time is 1.5 ...

Embodiment 3

[0033] A process for preparing neopentyl glycol by the calcium method. Firstly, the amount of various raw materials for each batch is prepared, then the condensation cooling water valve is opened, and the bottom discharge valve of the condensation kettle (5000L enamel reactor or stainless steel reactor) is closed. Calculate the amount of 1210L of 37% formaldehyde (equivalent to 16.4Kmol of formaldehyde), dilute the formaldehyde to 21-23% with 1000L of recovered condensed water, start stirring, and then add 740L of 97%-98% isobutyraldehyde (equivalent to 8Kmol of isobutyraldehyde) , at room temperature (generally 15-25°C), open the valve for adding alkali and add 10% calcium hydroxide suspension (equivalent to calcium hydroxide 2.25Kmol). If the temperature is higher than 35°C, the speed of adding calcium hydroxide should be well controlled during the process of adding calcium hydroxide. The speed of adding calcium hydroxide should not be too fast. 9 to 11, and the time is 2.5 ...

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Abstract

The invention relates to a novel process for preparing neopentyl glycol by taking calcium hydroxide as a condensing agent. The neopentyl glycol is prepared by taking isobutylaldehyde, formaldehyde and calcium hydroxide as raw materials. A production process of the process comprises the following steps of: performing a condensation reaction, wherein the condensation ratio of isobutylaldehyde to formaldehyde to calcium hydroxide is 1:2.1:0.55 (molar ratio), the concentration of isobutylaldehyde is 97-98 percent, the concentration of formaldehyde is 37 percent, and the concentration of calcium hydroxide (suspension) is 10 percent, and the condensation process parameters are that: the reaction temperature is 25-75 DEG C, the feeding time is 2-4 hours, and the heat-preserving reaction time is 1-3 hours; separating calcium formate in a steam stripping way; and distilling. Due to the adoption of the process, the price of calcium hydroxide serving as a raw material is lower than that of sodium hydroxide, and the added value of calcium formate serving as a byproduct is high; and the hydroxyl value of a neopentyl glycol product is high, and the quality is good.

Description

technical field [0001] The invention relates to a process for preparing organic chemical products, in particular to a process for preparing neopentyl glycol by calcium method. Background technique [0002] Currently, there are two processes for preparing neopentyl glycol: [0003] 1. Hydrogenation process [0004] Reaction principle: [0005] Condensation reaction: CH 3 (CH 3 )CHCHO+HCHO→CH 3 (CH 3 )C(CH 2 OH) CHO [0006] Hydrogenation reaction: CH 3 (CH 3 )C(CH 2 OH) CHO+H 2 →CH 3 (CH 3 )C(CH 2 Oh) 2 [0007] 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 glycol. [0008] The hydrogenation process...

Claims

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Application Information

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IPC IPC(8): C07C31/18C07C29/14C07C51/41C07C53/06
Inventor 李薇
Owner HENGYANG NORMAL UNIV
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