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Synthesis method of pentaerythritol

A pentaerythritol and synthesis method technology, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of low added value of sodium salt, low content of pentaerythritol, large amount of manual labor, etc., to reduce sodium The process of salt recovery, the effect of reducing the generation of three wastes and reducing the consumption of raw materials

Inactive Publication Date: 2015-11-25
ANHUI JINGHE IND
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  • Claims
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Problems solved by technology

This process is relatively mature in domestic production, but the steam consumption is high, the power consumption is high, the raw material consumption is high, and there are many side reactions in the reaction, the content of pentaerythritol is low, the sewage is much and difficult to handle, and the process is long. The amount of manual labor is large, and the added value of the by-product sodium salt is not high

Method used

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  • Synthesis method of pentaerythritol

Examples

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example 1

[0015] Such as figure 1 As shown, the present invention provides a process for synthesizing pentaerythritol by catalytic hydrogenation. The basic process steps are as follows: 1) put the prepared formaldehyde, acetaldehyde, and triethylamine into the condensation tank as required to carry out aldol condensation reaction Generate trimethylol acetaldehyde condensation liquid; 2) Quickly carry out rectification and separation after the condensation reaction, so that formaldehyde exists in triethylamine in the shortest possible time, avoiding the formation of side reactions, and rectifying formaldehyde and triethylamine and a small amount of methanol, formaldehyde and triethylamine are rectified again, and formaldehyde and triethylamine are separated, and the formaldehyde and triethylamine return to the condensation reaction to participate in the reaction again; 3) trimethylol acetaldehyde aqueous solution obtained after rectification Catalytic hydrogenation, using nickel-based ca...

example 2

[0018] Prepare formaldehyde, acetaldehyde and triethylamine according to the molar ratio of 5.5:1:1, first add formaldehyde to the condensation kettle, then drop triethylamine step by step, adjust the pH=8.0-8.2, and then drop acetaldehyde step by step During the reaction process, the pH is controlled at 8~9, the temperature is controlled at 28-30°C, and the reaction time is 1 hour. After the reaction results, the condensation liquid is pumped into the rectification tower, and the light components are rectified to obtain trimethylol ethyl alcohol. The aqueous solution of aldehyde is passed into the hydrogenation tower with high-purity hydrogen (purity above 99.9%), and the Raney nickel RTH-311 catalyst is used for catalytic hydrogenation reaction to obtain a pentaerythritol aqueous solution. A small amount of methanol is rectified from this aqueous solution to obtain concentrated The final pentaerythritol aqueous solution is evaporated, crystallized, centrifuged, and dried to o...

example 3

[0020] Prepare formaldehyde, acetaldehyde, and triethylamine according to the molar ratio of 5.8:1:1, first add formaldehyde to the condensation kettle, drop triethylamine step by step, adjust the pH=8.0, then drop acetaldehyde step by step, and react During the process, the pH is controlled at 8~9, the temperature is controlled at 28°C, and the reaction time is 1 hour. After the reaction results, the condensation liquid is pumped into the rectification tower, and the light components are rectified to obtain an aqueous solution of trimethylolacetaldehyde. Pass high-purity hydrogen (above 99.9% purity) into the hydrogenation tower, and use Raney nickel RTH-311 catalyst for catalytic hydrogenation reaction to obtain pentaerythritol aqueous solution. A small amount of methanol is rectified from this aqueous solution to obtain concentrated pentaerythritol aqueous solution , the solution was evaporated, crystallized, centrifuged, and dried to obtain the finished product of pentaeryt...

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Abstract

The invention relates to a synthesis method of pentaerythritol. The synthesis method comprises the following steps: (1) carrying out aldol condensation reaction on formaldehyde and acetaldehyde under the action of a weak base catalyst to generate trihydroxymethyl acetaldehyde; (2) after condensation reaction, carrying out distillation separation to separate out a formaldehyde, triethylamine and methanol mixed solution; (3) carrying out catalytic hydrogenation on a trihydroxymethyl acetaldehyde aqueous solution obtained after distillation by adopting a nickel catalyst; (4) distilling a pentaerythritol solution obtained after catalytic hydrogenation to recover methanol, and carrying out distillation recovery on methanol; and (5) carrying out evaporation, crystallization, centrifugation and drying on a distilled pentaerythritol solution to obtain a pentaerythritol finished product. Compared with the prior art, the synthesis method has the advantages that the pentaerythritol finished product has high purity and high yield, the side reaction is little, sodium salts are not generated, three wastes are few and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical production and relates to a process for synthesizing pentaerythritol by catalytic hydrogenation. Background technique [0002] 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, and its epoxy derivative is the raw material for the production of non-ionogenic surfactants. Pentaerythritol is easy to form complexes with metals, and is also used as a hard water softener in detergent formulations. In addition, it is also used in the production of medicines and pesticides. The molecule of pentaerythritol cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/24C07C29/141
CPCY02P20/584C07C45/45C07C29/141C07C29/76C07C29/78C07C29/80
Inventor 田家民施以军
Owner ANHUI JINGHE IND
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