Method for producing monopentaerythritol, bipentaerythritol and tripentaerythritol

A technology of dipentaerythritol and tripentaerythritol is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., and can solve the problems of low yield of tripentaerythritol, low total yield, decline in total yield, etc. The effect of aldehyde utilization rate, less disproportionation reaction and less heat release of chemical reaction

Active Publication Date: 2008-09-17
CHIFENG RUIYANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore use this current mainstream technology reaction production total yield to be on the low side, especially high value-added product bis, tripentaerythritol yield is on the low side; drop in magnitude

Method used

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  • Method for producing monopentaerythritol, bipentaerythritol and tripentaerythritol
  • Method for producing monopentaerythritol, bipentaerythritol and tripentaerythritol
  • Method for producing monopentaerythritol, bipentaerythritol and tripentaerythritol

Examples

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Embodiment 1

[0049]Take mass fraction 98% acetaldehyde 10Kmol, 12% formaldehyde solution 40Kmol, 32% sodium hydroxide 11Kmol, 85% formic acid appropriate amount and add respectively in acetaldehyde high level tank, formaldehyde high level tank, liquid caustic soda high level tank, formic acid high level tank, precondensation The nitrogen in the kettle and the main condensation kettle is pressurized to 0.05MPa, and then all the formaldehyde and acetaldehyde are evenly put into the precondensation kettle within 90 minutes, and the formaldehyde is 2 minutes earlier than the acetaldehyde; when the material in the precondensation kettle is full , then start the precondensation tank agitator and circulating pump and start adding sodium hydroxide, the amount of sodium hydroxide added is based on maintaining the pH value of the reaction solution in the precondensation tank at 8, and the temperature of the precondensation tank is controlled to be 35 °C; During the feeding process, the reaction liqui...

Embodiment 2

[0051] Take the mass fraction of 98% acetaldehyde 10Kmol, 15% formaldehyde solution 45Kmol, 32% sodium hydroxide 11.5Kmol, 85% formic acid and add appropriate amount to the acetaldehyde high-level tank, formaldehyde high-level tank, liquid alkali high-level tank, formic acid high-level tank, pre-condensation The nitrogen in the kettle and the main condensation kettle is pressurized at 0.08MPa, and all the formaldehyde and acetaldehyde are fed within 30 minutes. The temperature is controlled at 55°C, and the other steps are the same as in Example 1.

Embodiment 3

[0053] Take the mass fraction of 98% acetaldehyde 10Kmol, 18% formaldehyde solution 50Kmol, 32% sodium hydroxide 12Kmol, 85% formic acid in appropriate amount and add them to the acetaldehyde high level tank, formaldehyde high level tank, liquid alkali high level tank, formic acid high level tank respectively, pre-condensation kettle , The nitrogen in the main condensation tank is pressurized to 0.10MPa, all the formaldehyde and acetaldehyde are fed within 60 minutes, the pH value of the reaction liquid in the pre-condensation tank is maintained at 8.5, the temperature is controlled at 30°C, and the temperature of the main condensation tank is controlled Be 60 ℃, other steps are with embodiment 1.

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Abstract

The invention discloses a method of producing mono-pentaerythritol, dipentaerythritol and tri-pentaerythritol. The adopted production raw materials comprise acetaldehyde and formaldehyde. An activator adopts liquid alkali. The liquid alkali is sodium hydroxide or calcium oxide; neutralization reagent adopts formic acid solution; the acetaldehyde and the formaldehyde are both dived into a pre-condensation kettle which is pressurized with inert gases. Reaction liquid reacts for a period in the pre-condensation kettle, and then the reaction liquid is shifted to a main condensation kettle which is pressurized with the inert gases to keep on reacting. The alkalinity of the reaction liquids in both reaction kettles is maintained to be different. The concrete method comprises the following steps: materials preparation, charging pre-condensation, the diversion of the reaction liquid, constant temperature condensation, neutralization and separation, etc. By adopting the technology, the yield rate of the dipentaerythritol is enhanced to 45 percent from existing 21 percent, and the main conversion rate of the acetaldehyde is more than 90 percent.

Description

technical field [0001] The invention relates to a production method of pentaerythritol, in particular to a method for producing mono-, di- and tripentaerythritol using acetaldehyde, formaldehyde, sodium hydroxide or calcium hydroxide lye as raw materials. Background technique [0002] Pentaerythritol is a typical tetrahydric alcohol of neopentyl structure. According to the composition and content of pentaerythritol separated from the condensation product, it can be divided into industrial grade pentaerythritol, monopentaerythritol, dipentaerythritol and triple pentaerythritol. It is mainly used in the production of alkyd resins, synthetic lubricating oils, rosin / tal oil esters and explosives, etc. [0003] At present, the average scale of my country's pentaerythritol production equipment is small, the production level is low, the product quality is poor, the consumption is high, the cost is high, and the market competitiveness is poor; except for a few enterprises, most ente...

Claims

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Application Information

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IPC IPC(8): C07C43/12C07C31/24C07C41/01C07C29/38
Inventor 刘启东朱建文彭枝忠许继平全宏东刘武
Owner CHIFENG RUIYANG CHEM
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