Process for esterification production of phthalate

A technology of phthalic acid and production process, which is applied in the field of phthalate esterification production technology, can solve the problems of slow reaction speed, difficult to realize industrialized production and the like, and achieves the effects of good color and high volume resistivity

Inactive Publication Date: 2006-12-27
池青松
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0004] In order to overcome the above shortcomings, people have carried out research on non-acidic catalysts, and found that when alumina is used as a catalyst, the selectivity of its products is better, but the reaction speed is slow, and it is difficult to realize industrial production.

Method used

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Examples

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Embodiment Construction

[0025] Below the phthalates esterification production technique of the present invention is exemplified and described in detail as follows:

[0026] First, add 420 parts of 2-ethylhexanol and 200 parts of phthalic anhydride into a 2000-liter reactor equipped with a condenser, water separator, mixer and thermometer as raw materials, heat and dissolve with steam through the jacket, and stir while stirring to obtain Monooctyl phthalate, complete monoester reaction.

[0027] Then, 16 parts by weight of 10% aluminum oxide alcohol suspension and 0.4 parts of 20% aqueous sodium hydroxide solution were added to the reactor, and stirred at 120° C. for 1 hour to completely generate aluminate Sodium, then, add 0.8 parts of 12.5% ​​lithium hydroxide aqueous solution at the same temperature, slowly raise the temperature, and carry out the diester reaction until the reaction water begins to distill at about 170°C, and the reaction ends in about 3 hours. At the end of esterification, the te...

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Abstract

The invention relates to a process for preparing phthalate, comprising following steps: (1) taking benzoic anhydride and relative excess alcohols as raw material, stirring and heating for dissolution, getting monoesters; (2) adding solid aluminum oxide into said alcohols solution, acting with caustic soda solution, getting sodium aluminate, adding lithium hydrate into said reactant of benzoic anhydride and alcohols for bi-esters action; filtering lithium compounds from reactants after reaction and getting coarse ester; (3) neutralizing said coarse ester to be alkalinity, washing alkalinity, dewatering and dealcoholizing, getting phthalate. The process is characterized by good color of product and high volume electrical resistivity.

Description

Technical field: [0001] The invention relates to a production process of esterification of phthalic acid esters, which is a new production process for producing phthalic acid esters by reacting phthalic anhydride and alcohol. Background technique: [0002] In the industrial production of phthalates, acidic substances such as sulfuric acid are still generally used as catalysts in its manufacturing process. When these acidic substances are used as catalysts, side reactions such as alcohol dehydration and isomerization will occur during the esterification process. , as a result, some colored and odorous substances are formed. Therefore, the product after esterification must be decolorized, and a large amount of sodium hydroxide is used for neutralization and other post-treatments. Even after this treatment, the product quality is also poor, and the color and luster Not good, the resistivity is low, and the yield of the product is also low. [0003] For example: adopt phthalic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C69/80
Inventor 池青松陈鸿发
Owner 池青松
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