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Continuous esterification production method of di-sec-octyl phthalate

A di-sec-octyl phthalate and production method technology, applied in the field of esterification synthesis, can solve the problems of intermittent esterification energy consumption, high material consumption, inability to realize large-scale production, and large fluctuations in product quality, so as to reduce dust Pollution, stable and uniform product quality, and the effect of improving quality and production efficiency

Active Publication Date: 2013-12-18
WEIFANG YUANLI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing intermittent production has the following disadvantages: (1) The product quality fluctuates greatly and is not very stable; (2) The process is backward and the labor intensity is high; (3) The energy consumption and material consumption of the intermittent esterification are high, the product yield is low, and the conversion The yield is generally about 98wt%, and the scale is small, so it is impossible to realize large-scale production, which restricts the output of DCP

Method used

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  • Continuous esterification production method of di-sec-octyl phthalate

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Experimental program
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Effect test

Embodiment 1

[0025] Put the raw material phthalic anhydride and secondary octanol (99.5wt% secondary octanol content, 0.2wt% octanol, 0.3wt% impurity) into the primary esterification reaction kettle in a molar ratio of 1:2.5 after pre-melting, and add phthalic anhydride at the same time With a titanate catalyst with a total amount of 2wt‰ of 2-octanol, the temperature of the primary esterification reaction kettle starts to rise when the feed amount of the primary esterification reaction kettle reaches 30% of the volume of the esterification reaction kettle, and the primary esterification reaction is carried out. The temperature is 200°C, and after the esterification reaction is completed, the material overflows from the side wall of the first-stage esterification reactor and enters the second-stage esterification reactor, and the fifth-stage esterification reaction is carried out in sequence. The temperature of the second-stage esterification reaction is 204°C , The temperature of the third...

Embodiment 2

[0027] Add raw material phthalic anhydride and secondary octanol (99.5wt% secondary octanol content, 0.2wt% octanol, 0.3wt% impurity) in a molar ratio of 1:2.6 into the primary esterification reactor after pre-melting, and add phthalic anhydride at the same time With a titanate catalyst with a total amount of 4‰ of 2-octanol, the temperature of the primary esterification reactor starts to rise when the feed amount of the primary esterification reactor reaches 30% of the volume of the esterification reactor, and the primary esterification reaction is carried out. The primary esterification reaction The temperature is 202°C, and after the esterification reaction is completed, the material overflows from the side wall of the first-stage esterification reactor and enters the second-stage esterification reactor, and the fifth-stage esterification reaction is carried out in sequence, and the temperature of the second-stage esterification reaction is 206°C , The tertiary esterificatio...

Embodiment 3

[0029] Add raw material phthalic anhydride and secondary octanol (99.5wt% secondary octanol content, 0.2wt% octanol, 0.3wt% impurity) in a molar ratio of 1:2.7 into the primary esterification reactor after pre-melting, and add phthalic anhydride at the same time With a titanate catalyst with a total amount of 2wt‰ of 2-octanol, the temperature of the primary esterification reaction kettle starts to rise when the feed amount of the primary esterification reaction kettle reaches 30% of the volume of the esterification reaction kettle, and the primary esterification reaction is carried out. The temperature is 203°C, and after the esterification reaction is completed, the material overflows from the side wall of the first-stage esterification reactor and enters the second-stage esterification reactor, and the fifth-stage esterification reaction is carried out in sequence, and the temperature of the second-stage esterification reaction is 207°C , The tertiary esterification reaction...

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Abstract

The invention discloses a continuous esterification production method of di-sec-octyl phthalate. The method comprises the following steps: using phthalic anhydride and 2-octanol to perform an esterification reaction under the existence of catalyst and obtain raw ester, and post-processing raw ester to obtain the product di-sec-octyl phthalate, wherein the esterification reaction is a multistage esterification reaction that phthalic anhydride and 2-octanol perform a plurality of esterification continuously. The esterification reaction of the invention adopts the production method of continuous esterification, the esterification reaction is complete, the conversion rate is high, the acid value of the product is low and the purity is high; and the time of esterification is short, the energy consumption is low, the product quality is stable, and the quality and production efficiency of di-sec-octyl phthalate can be effectively increased.

Description

technical field [0001] The invention relates to the technical field of esterification synthesis, in particular to a continuous esterification production method of di-sec-octyl phthalate. Background technique [0002] Di-sec-octyl phthalate (DCP) is a plasticizer product. It is an excellent plasticizer with good comprehensive performance. It has good mixing performance and high plasticizing efficiency. Its performance is similar to that of phthalic acid. Dioctyl (DOP), and heat resistance, light resistance, weather resistance and electrical insulation are better, but plasticizing efficiency, oil resistance, gasoline extraction resistance is slightly lower. It can usually be used as a substitute for DOP, especially suitable for plastisol, with good viscosity stability, widely used in cable materials, tapes, floor leather and other products. DCP plasticizers are now produced by batch esterification, and the catalysts used are divided into acidic catalyst system and non-acidic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/80C07C67/08
Inventor 张敏刘修华杨辉谭立文秦国栋
Owner WEIFANG YUANLI CHEM
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