Non-drying preparation technology of ethylene glycol antimony

Abstract

The invention which provides a non-drying preparation technology of ethylene glycol antimony relates to a preparation method of an antimony-containing compound catalyst for a polyester polycondensation reaction. The preparation method, which comprises the following steps: treating excessive ethylene glycol and diantimony trioxide as raw materials, carrying out esterification and dehydration under heating and negative pressure conditions, and filtering and cooling to crystallize, is characterized in that: cooled and crystallized crystals are directly subjected to quality inspection and packing after being dried by a centrifugation drier. In the invention, procedures of drying and washing are omitted, so the damage to ethylene glycol antimony chelates Sb2(OCH2CH2O)3 caused by drying is avoided, and usage of high toxic, flammable and explosive methanol and ethanol is avoided, thereby the production environment is improved, unsafe factors are eliminated, the technology is simplified and the safety cost is reduced; and simultaneously products of the technology of the present invention have 54% to 55% of antimony, the content of antimony is controlled below a theoretical value, and diantimony trioxide is eliminated in the products, so the catalytic performance of the products is improved, the dissolving temperature is reduced, a b value and an L value are improved, and raw material consumption is reduced.

Description

[0001] This application is a divisional application, original application date: 2007.6.26, application number: 200710035237.3, invention name: Preparation method of crystalline ethylene glycol antimony technical field [0002] The invention relates to a non-drying preparation method of an antimony compound catalyst used in polycondensation reaction of polyester. Background technique [0003] Ethylene glycol antimony is the third generation polyester catalyst after antimony trioxide and antimony acetate. There are many ways to prepare ethylene glycol antimony, such as Chinese patent, application date 99.4.16, application number 99114156.3, a high-purity ethylene glycol antimony preparation method (abbreviated as prior art 1), is based on excessive ethylene glycol Alcohol and antimony trioxide undergo lipidation dehydration reaction in the temperature range of 120-180°C, filter, cool, crystallize, and recrystallize with ethylene glycol, wash with alcohol to remove ethylene gly...

AI Technical Summary

Problems solved by technology

The content of antimony trioxide in the product is 57.28~57.89%. The above prior art has a drying process without exception, and part of the Sb will be made during the drying process. 2 (OCH 2 CH 2 O) 3 The chelating structure of the product is destroyed and reduced to antimony trioxide, so that the content of antimony trioxide in the product exceeds the theoretical value (57.47%), the prior art 1 reaches 57.6%, and the prior art 2 reaches 57.52% %, prior art 3 has reached 58.5%, and prior art 4 has reached 57.89%. Because the product contains antimony trioxide, it not only increases the consumption of antimony trioxide, but also reduces the catalytic effect of antimony glycol. influences

In addition, in the prior art, there is a washing process. Except that the prior art 3 uses ethylene glycol for washing (ie, ethylene glycol recrystallization), the washing liquid used in the rest is methanol with high toxicity, low boiling point, and flammability. or ethanol, increasing production costs and safety costs