Production method for 90-level dipentaerythritol
A technology for dipentaerythritol and a production method, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of inaccurate control of feeding materials, uneven mixing of raw materials, affecting the quality of dipentaerythritol products, etc., and achieve high quality , the effect of inhibiting the formation of tripentaerythritol and polypentaerythritol
Inactive Publication Date: 2015-12-09
ANHUI JINGHE IND
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Problems solved by technology
[0003] At present, the general production of dipentaerythritol uses formaldehyde, acetaldehyde, and sodium hydroxide as raw materials, but the molar ratio of the existing process is low, the raw materials are not mixed uniformly, and the feeding control is not accurate, resulting in pentaerythritol formal in the synthesis process of dipentaerythritol. , tripentaerythritol and polypentaerythritol account for 3%, 12% and 5% respectively, and the content of dipentaerythritol can only reach 80 grades, seriously affecting the quality of dipentaerythritol products
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[0019] Such as figure 1 Shown, the present invention provides a kind of production method of 90 grade dipentaerythritol, comprises the following steps:
[0020] a) Condensation reaction of 17%-18% formaldehyde solution, 20% acetaldehyde solution and 25% sodium hydroxide solution in a tubular reactor for 3 hours according to the molar ratio of 4.3:1:1.1, and the temperature is controlled during batching At 20°C, the temperature after the reaction is controlled at 60°C; the condensed liquid obtained by the reaction is kept at 60°C for 1 hour and sent to the neutralization tank, and the condensed liquid is neutralized to a pH value of 6.5 with formic acid; the ingredients, temperature control, The holding time and neutralization are automatically controlled by DCS system;
[0021] b) Condensation liquid containing pentaerythritol, sodium formate, water, formaldehyde and methanol is preheated by plate heat exchanger, enters the dealdehyde tower to remove 99.5% formaldehyde and 55...
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The invention discloses a production method for 90-level dipentaerythritol. On the basis of the existing technological method for 80-level dipentaerythritol, 17%-18% of a formaldehyde solution, 20% of an acetaldehyde solution and 25% of a sodium hydroxide solution are subjected to a condensation reaction inside a tubular reactor according to the male ratio of 4.3:1:1:1.1 by means of the DSC control technology, the ratio is strictly controlled, and generation of tripentaerythritol and multipentaerythritol is effectively restrained on the basis of a secondary product of the dipentaerythritol through continuous production of the tubular reactor, so that the high-quality 90-level dipentaerythritol is obtained.
Description
technical field [0001] The invention relates to the field of chemical product production, in particular to a production method of grade 90 dipentaerythritol. Background technique [0002] Dipentaerythritol is an organic compound with a wide range of uses. It can be used to manufacture high-grade temperature-resistant lubricating grease, high-grade resin, transparent photopolymerization materials, and flame-retardant materials. It is an excellent non-toxic additive for polyethylene and polyvinyl chloride, making it It has good ductility and anti-aging properties. [0003] At present, the general production of dipentaerythritol uses formaldehyde, acetaldehyde, and sodium hydroxide as raw materials, but the molar ratio of the existing process is low, the raw materials are not mixed uniformly, and the feeding control is not accurate, resulting in pentaerythritol formal in the synthesis process of dipentaerythritol. , tripentaerythritol and polypentaerythritol account for 3%, 12...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C07C43/13C07C41/01C07C31/24C07C29/38
CPCC07C41/01C07C29/38C07C43/132C07C31/245
Inventor 陶长文翁自飞
Owner ANHUI JINGHE IND