发明名称 |
PROCESS FOR PRODUCING MONOPENTAERYTHRITOL OF HIGH PURITY AND MONOPENTAERYTHRITOL PRODUCED BY THE PROCESS |
摘要 |
The invention relates to a process for producing monopentaerythritol of high purity and monopentaerythritol produced by the process. Formaldehyde is reacted with acetaldehyde in an aqueous solution in the presence of a strongly basic hydroxide in a conventional way. The obtained reaction mixture is evaporated to a dryness of 50-70 % by weight and is thereafter cooled. Crystals of pentaerythritol thereby formed are separated off. The crystals are dissolved in water or in a water-containing mother liquor containing pentaerythritol to a dryness of 35-55 % by weight. The solution is treated in a purification step whereupon monopentaerythritol of high purity is crystallized at a temperature of 40-90°C and separated from the remaining mother liquor which is recirculated to the above mentioned step. |
申请公布号 |
EA014784(B1) |
申请公布日期 |
2011.02.28 |
申请号 |
EA20080001796 |
申请日期 |
2007.02.05 |
申请人 |
PERSTORP SPECIALTY CHEMICALS AB |
发明人 |
BENGTSSON HANS-AKE;NYMAN LARS-HENRIK |
分类号 |
C07C31/24;C07C29/38 |
主分类号 |
C07C31/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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