Production system and production technology for 99-grade pentaerythritol

A pentaerythritol and production process technology, applied in the field of pentaerythritol production technology, can solve the problems of high labor intensity and personnel intensity, reduced pentaerythritol production efficiency, reduced pentaerythritol purity, etc., achieves low labor intensity and personnel intensity, and eliminates moisture The effect of exceeding the standard and material condensation, improving the purity and yield

Active Publication Date: 2019-03-08
CHIFENG RUIYANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it can be accompanied by the generation of a large amount of other by-products when preparing pentaerythritol, which causes the purity of pentaerythritol to decrease and the acetal content to be high; moreover, the degree of automation is low when preparing pentaerythritol, and labor intensity and labor intensity are all relatively large. This preparation method in the patent not only reduces the production efficiency of pentaerythritol, but also increases the input of production cost

Method used

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  • Production system and production technology for 99-grade pentaerythritol
  • Production system and production technology for 99-grade pentaerythritol

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: a kind of production technique of 99 grades of pentaerythritol, this production technique comprises the steps:

[0033] S1: Formaldehyde, acetaldehyde and liquid caustic soda are put into the four-stage series tank reactor in the reaction unit 2 through the feeding unit 1 according to the molar ratio of 9.5:1:1.15 for condensation reaction, and the mixed components are obtained; Among them, the temperatures of the first-stage reactor 19, the second-stage reactor 21, the third-stage reactor 23 and the fourth-stage reactor 25 are respectively controlled at 22°C, 28°C, 32°C, and 38°C; the final mixed components flow into the neutralization kettle And use formic acid to adjust to a suitable pH to obtain a condensation liquid; the feeding ratio and temperature are automatically controlled by the DCS system;

[0034] S2: When preheating the condensation liquid, use alcohol-containing dilute formaldehyde as the heat source, then transport the preheated condensati...

Embodiment 2

[0040] Embodiment 2: a kind of production technique of 99 grades of pentaerythritol, this production technique comprises the steps:

[0041] S1: Formaldehyde, acetaldehyde and liquid caustic soda are put into the four-stage series tank reactor in the reaction unit 2 through the feeding unit 1 according to the molar ratio of 9.5:1:1.15 for condensation reaction, and the mixed components are obtained; Among them, the temperatures of the first-stage reactor 19, the second-stage reactor 21, the third-stage reactor 23, and the fourth-stage reactor 25 are respectively controlled at 25°C, 30°C, 35°C, and 40°C; the final mixed components flow into the neutralization kettle And use formic acid to adjust to a suitable pH to obtain a condensation liquid; the feeding ratio and temperature are automatically controlled by the DCS system;

[0042] S2: When the condensation liquid is preheated, alcohol-containing dilute formaldehyde is used as a heat source, and then the preheated condensatio...

Embodiment 3

[0048] Embodiment 3: a kind of production technique of 99 grades of pentaerythritol, this production technique comprises the steps:

[0049] S1: Formaldehyde, acetaldehyde and liquid caustic soda are put into the four-stage series tank reactor in the reaction unit 2 through the feeding unit 1 according to the molar ratio of 9.5:1:1.15 for condensation reaction, and the mixed components are obtained; Among them, the temperatures of the first-stage reactor 19, the second-stage reactor 21, the third-stage reactor 23, and the fourth-stage reactor 25 are respectively controlled at 26°C, 31°C, 36°C, and 41°C; the final mixed components flow into the neutralization kettle And use formic acid to adjust to a suitable pH to obtain a condensation liquid; the feeding ratio and temperature are automatically controlled by the DCS system;

[0050] S2: When preheating the condensation liquid, use alcohol-containing dilute formaldehyde as the heat source, then transport the preheated condensat...

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Abstract

The invention discloses a production system and a production technology for 99-grade pentaerythritol. The production system comprises a feeding unit, a reaction unit, an aldehyde removal unit, an alcohol removal unit, an evaporation unit, a crystallization unit, a centrifugal unit and a drying unit. A sodium method is adopted to continuously produce the pentaerythritol, formaldehyde and acetaldehyde are taken as raw materials to carry out condensation reaction under caustic soda liquid catalysis, formic acid is used for neutralization after reaction ends, and therefore, pentaerythritol and a byproduct, i.e., sodium formate are generated; then, through working procedures, including aldehyde removal, alcohol removal, evaporation, crystallization, separation, drying and the like, the 99-gradepentaerythritol finished product is obtained. According to the production system and the production technology, a pentaerythritol, dipentaerythritol and tripentaerythritol co-production technology can be realized, the generation of byproducts can be reduced so as to improve purity and yield, the removal rate of methyl aldehyde can be 99.9% by aldehyde removal, and the quantity of residual methylaldehyde in the product is reduced. The production system has the advantages of high automation degree and small labor intensity and personnel intensity, meanwhile, the production efficiency of the pentaerythritol is improved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of pentaerythritol production technology, and in particular relates to a 99-grade pentaerythritol production system and a production process thereof. Background technique [0002] Pentaerythritol, formula C 5 h 12 o 4 , white crystal or powder, flammable, easy to be esterified by general organics, widely used in the coating industry to produce alkyd resins, synthetic high-grade lubricants, plasticizers, surfactants and as raw materials for medicines and explosives. Pentaerythritol is mainly used in the paint industry and can be used to make alkyd resin paints, which can improve the hardness, gloss and durability of paint films. It is also used as a raw material for rosin resin required for paints, varnishes and printing inks, and can be used to make drying oils, smoldering paints and aviation lubricants. The fatty acid ester of pentaerythritol is an efficient lubricant and polyvinyl chloride plasticizer,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/38C07C29/76C07C29/78C07C29/80C07C31/24
CPCC07C29/38C07C29/76C07C29/78C07C29/80C07C31/245
Inventor 刘启东刘泉李万忠全宏冬彭枝忠李权唐宜谦叶陆仟
Owner CHIFENG RUIYANG CHEM
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