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Dibutyl phthalate production process capable of preventing crystallization in esterification kettle

A dibutyl phthalate and production process technology, applied in the field of dibutyl phthalate production process, can solve the problems of high steam energy consumption, prolonging the esterification time, affecting the heating efficiency of the esterification tank, etc., achieving Improve production efficiency, shorten energy saving, and shorten the effect of esterification time

Pending Publication Date: 2020-09-04
福建春达化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the traditional production process, when naphthalene phthalic anhydride is used as a raw material, a layer of khaki crystals often adheres to the outer wall of the steam heating tube in the esterification kettle during the esterification reaction, which will seriously affect the heating efficiency of the esterification kettle and cause esterification. Extended time, high steam consumption

Method used

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  • Dibutyl phthalate production process capable of preventing crystallization in esterification kettle
  • Dibutyl phthalate production process capable of preventing crystallization in esterification kettle

Examples

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Embodiment 1

[0020] The present invention relates to a kind of dibutyl phthalate production technology that prevents crystallization in the esterification still, such as figure 1 , figure 2 As shown, n-butanol, naphthalene phthalic anhydride, and concentrated sulfuric acid are sequentially added to the esterification kettle 1 to heat up the reaction, and the temperature of the esterification kettle 1 is heated by an inner coil. for 6h. The steam evaporated from the top of the esterification kettle 1 enters the esterification tower 2 and then condenses through the condenser (1) 3, then enters the alcohol-water separation tank (1) 4 for alcohol-water separation, and the separated reflux alcohol flows from the esterification tower 2 It is added at the top of the tower, and flows into the esterification kettle 1 after reverse contact with the steam steamed from the esterification kettle 1; after the esterification reaction is completed, the product is introduced into the neutralization kettl...

Embodiment 2

[0023] The present invention relates to a kind of dibutyl phthalate production technology that prevents crystallization in the esterification still, such as figure 1 , figure 2 As shown, n-butanol, naphthalene phthalic anhydride, and concentrated sulfuric acid are sequentially added to the esterification kettle 1 to heat up the reaction, and the temperature of the esterification kettle 1 is heated by an inner coil. It is 5.5h. The steam evaporated from the top of the esterification kettle 1 enters the esterification tower 2 and then condenses through the condenser (1) 3, then enters the alcohol-water separation tank (1) 4 for alcohol-water separation, and the separated reflux alcohol flows from the esterification tower 2 It is added at the top of the tower, and flows into the esterification kettle 1 after reverse contact with the steam steamed from the esterification kettle 1; after the esterification reaction is completed, the product is introduced into the neutralization k...

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Abstract

The invention discloses a dibutyl phthalate production process capable of preventing crystallization in an esterification kettle. Raw materials are sequentially added into the esterification kettle for heating reaction, steam evaporated from the top of the esterification kettle enters an esterification tower and then enters an alcohol-water separation tank (1) for alcohol-water separation after being condensed by a condenser (1), and separated reflux alcohol is added from the top of the esterification kettle, is in reverse contact with the steam evaporated from the esterification kettle and then flows into the esterification kettle; after completion of esterification reaction, the product is introduced into a neutralization kettle for neutralization; the neutralized wastewater is added from a wastewater tower and then flows into a reboiler to be heated; steam evaporated from the reboiler enters the wastewater tower, is condensed by a condenser (2) and then enters an alcohol-water separation tank (2) for alcohol-water separation, the separated recycled alcohol is introduced into a recycled alcohol supplementing tank, and the recycled alcohol is added from the top of the esterification tower, is in reverse contact with the steam evaporated from the esterification kettle and then flows into the esterification kettle for esterification reaction. According to the production process,crystals in the esterification kettle can be remarkably reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of plasticizer production, in particular to a dibutyl phthalate production process for preventing crystallization in an esterification kettle. Background technique [0002] Dibutyl phthalate is a plasticizer product with high plasticizing efficiency and wide application. It is mainly used as the main plasticizer for cellulose resin and polyvinyl chloride products, especially for nitrocellulose resin. It has excellent solubility, decomposition and adhesion, and the softness and stability of the paint film are also good. [0003] In the traditional production process, when naphthalene phthalic anhydride is used as a raw material, a layer of khaki crystals often adheres to the outer wall of the steam heating tube in the esterification kettle during the esterification reaction, which will seriously affect the heating efficiency of the esterification kettle and cause esterification. The time is prolonged, and th...

Claims

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Application Information

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IPC IPC(8): C07C67/08C07C67/48C07C67/54C07C67/58C07C69/80
CPCC07C67/08C07C67/48C07C67/54C07C67/58C07C69/80
Inventor 吴军陈树健李红波
Owner 福建春达化工有限公司
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