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A kind of production method of potassium method pentaerythritol
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A pentaerythritol and production method technology, applied in chemical instruments and methods, preparation of organic compounds, separation/purification of carboxylic acid compounds, etc., can solve the problem of easy crystallization and precipitation of calcium formate to block equipment and pipelines, affect the quality of pentaerythritol products, calcium method The process is not mature and stable, and the production method is simple and feasible, with high added value and no pollution to the environment.
Active Publication Date: 2016-04-20
CHIFENG RUIYANG CHEM
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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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Embodiment 1
[0020] The production method of potassium method pentaerythritol, comprises the following steps that are connected in sequence:
[0021] A. The formaldehyde, acetaldehyde and potassium hydroxide are reacted according to the molar ratio of 6.0:1:1.3, the reaction temperature is 40 ° C, the reaction time is 2h, and then the reaction solution is neutralized to PH=6.5 after constant temperature for 1h;
[0022] B, remove excessive formaldehyde and the methyl alcohol that side reaction produces in the material obtained from step A;
[0023] C, the material obtained from step B is concentrated to a solution specific gravity of 1.250g / ml, and then crystallized by cooling for 6h;
[0024] D. Centrifuge, wash and dry the material obtained in step C at 70° C. to obtain a 98-grade monopentaerythritol with a mass content of 98.5%, a platinum-cobalt chroma of 40, and an ash content of 0.02%, and the yield is greater than 95%.
[0025] E, the filter cake obtained by settling and filtering ...
Embodiment 2
[0028] The production method of potassium method pentaerythritol, comprises the following steps that are connected in sequence:
[0029] A. React with formaldehyde, acetaldehyde and potassium hydroxide in a molar ratio of 5.0:1:1.2, the reaction temperature is 60°C, the reaction time is 2h, and the reaction solution is neutralized to PH=6.5 after constant temperature for 1h;
[0030] B, remove excessive formaldehyde and the methyl alcohol that side reaction produces in the material obtained from step A;
[0031] C, the material obtained from step B is concentrated to a solution specific gravity of 1.250g / ml, and then crystallized by cooling for 8h;
[0032] D, the material obtained in step C is centrifuged, washed and dried at 65°C to obtain a 98-grade monopentaerythritol with a mass content of 98.3%, a platinum-cobalt chroma of 50, and an ash content of 0.03%, and the yield is greater than 95%;
[0033] E, the filter cake obtained by settling, filtering the obtained mother l...
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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 in particular relates to a production method of potassium method pentaerythritol. Background technique [0002] At present, the production route of pentaerythritol at home and abroad basically adopts the reaction of formaldehyde and acetaldehyde in sodium hydroxide or calcium hydroxide as a catalyst to prepare. This kind of production process has the following problems: 1. Although the sodium method is mature in technology, it is bound to be difficult to achieve 95-98% of the quality of the by-product sodium formate to meet the needs of the market if it is produced under the condition of full circulation of the mother liquor; 2 , The calcium method is not mature and stable, the operation steps are complicated, the calcium formate is easy to crystallize and precipitate, and the phenomenon of blocking equipment and pipelines is serious, and once the mother liquor is fully circulated,...
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Application Information
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