Production method of pentaerythritol by virtue of potassium method

Abstract

The invention discloses a production method of pentaerythritol by virtue of a potassium method. The pentaerythritol is prepared from formaldehyde, acetaldehyde and potassium hydroxide at a molar ratio of (4.5-12):1:(1.1-1.5). The production method of pentaerythritol by virtue of the potassium method is simple and feasible, high in yield and no phenomenon of equipment clogging is caused; the pentaerythritol-series products have conversion rate which reaches above 98% and total yield which can reach 95%; the products have excellent quality(the content is equal to or greater than 98.0%, the ash content is less than or equal to 0.03% and the platinum-cobalt colority is less than or equal to 50); the purity of a byproduct potassium formate is greater than 96% and can reach the requirement of potassium formate for a drilling fluid, the products have high added-value, and the production process has good total economy; all mother liquid is closely circulated and is environmentally friendly and free of pollution.

Description

Technical field [0001] The invention belongs to the field of chemical product preparation, and specifically relates to a method for producing pentaerythritol by a potassium method. Background technique [0002] At present, the production routes of pentaerythritol at home and abroad are basically prepared by reacting formaldehyde and acetaldehyde with sodium hydroxide or calcium hydroxide as a catalyst. This kind of production process has the following problems: 1. Although the sodium process technology is mature, it must be produced under the condition of full circulation of mother liquor. It is bound to be difficult to achieve 95-98% of the by-product sodium formate in order to meet the needs of the market; , Calcium process is not mature and stable, and the operation steps are complicated. Calcium formate is easy to crystallize and block equipment and pipelines. Once the mother liquor is fully circulated, it will directly affect the quality of pentaerythritol products. Summary...

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Problems solved by technology

There are following problems in this kind of production technique: 1, though the sodium method technique is mature in technology, it will be produced under the condition of full cycle of mother liquor, it must be difficult to accomplish 95-98% of the quality of by-product sodium formate, to adapt to the needs of the market; 2 1. The calcium process is not yet mature and stable, and the operation steps are complicated. Calcium formate is easy to crystallize and precipitate to block equipment and pipelines, and once the mother liquor is fully circulated, it will directly affect the quality of pentaerythritol products.

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