Continuous esterification production method for plasticizer

A production method and technology for plasticizers, which are applied in chemical instruments and methods, organic chemistry, carboxylate preparation, etc., can solve the problems of inability to achieve large-scale production, large fluctuations in product quality, and restriction of plasticizer output. Shorten production time, stable product quality, and save manpower and material resources

Inactive Publication Date: 2012-06-20
WEIFANG YUANLI CHEM
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AI Technical Summary

Problems solved by technology

[0003] The existing production process of ortho-phthalic plasticizers in our country adopts batch esterification method. In the process, phthalic anhydride and alcohol are used for esterification reaction under the condition of catalyst. The reaction device adopts multiple reactors connected in series. After the reaction in the reactor is completely completed, the reactor is shut down, and the reaction product is transferred to the subsequent reactor to continue the reaction, so that after multiple intermittent esterification reactions, the prepared plasticizer is extracted from the last reactor , this existing batch production has the following disadvantages: (1) batch production takes a long time, the product quality fluctuates greatly, and is not stable; (2) the process is backward and labor-intensive; (3) batch esterification can High consumption and material consumption, low product yield; (4) Small scale, unable to achieve large-scale production, which restricts the output of plasticizers

Method used

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  • Continuous esterification production method for plasticizer
  • Continuous esterification production method for plasticizer

Examples

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Effect test

Embodiment 1

[0032] Mix phthalic anhydride and octanol at a molar ratio of 1:2.7, raise the temperature to 180°C, separate and remove the generated water from the top of the pre-esterification kettle 1, and obtain the pre-esterification material; preheat the octanol through the preheater 4 to 150°C, and then heated to 200°C by the heater 5 to obtain superheated octanol gas; the pre-esterification material is continuously entered from the middle and upper part of the first-stage continuous esterification reactor 2, and the superheated octanol gas is obtained from the first-stage continuous esterification reaction The upper end of the reboiler at the lower part of the device 2 enters, and the superheated octanol gas upwardly reacts with the pre-esterified material entering from the upper part on the catalyst reaction bed. The catalyst is ferric chloride, and the amount of catalyst added is 6wt% of the amount of phthalic anhydride , the bottom temperature of the primary continuous esterificati...

Embodiment 2

[0034]Mix phthalic anhydride and sec-octanol at a molar ratio of 1:2.8, raise the temperature to 170°C, separate and remove the generated water from the top of the pre-esterification kettle 1, and obtain the pre-esterification material; pass the sec-octanol through the preheater 4 first Preheated to 145°C, and then heated to 210°C by heater 5 to obtain superheated 2-octanol gas; the pre-esterified material is continuously fed from the middle and upper part of the first-stage continuous esterification reactor 2, and the superheated 2-octanol gas is fed from the first-stage The upper end of the reboiler in the lower part of the continuous esterification reactor 2 enters, and the superheated 2-octanol gas goes up and the pre-esterified material entering from the upper part undergoes a countercurrent reaction on the catalyst reaction bed. The catalyst is stannous oxide, and the amount of catalyst added is phthalic anhydride 8wt% of the amount, control the bottom temperature of the ...

Embodiment 3

[0036] Mix phthalic anhydride and n-butanol at a molar ratio of 1:2.5, raise the temperature to 150°C, separate and remove the generated water from the top of the pre-esterification kettle 1 to obtain the pre-esterification material; pass the n-butanol through the preheater 4 first Preheated to 130°C, and then heated to 200°C by heater 5 to obtain superheated n-butanol gas; the pre-esterification material is continuously entered from the middle and upper part of the first-stage continuous esterification reactor 2, and the superheated n-butanol gas is fed from the first-stage The upper end of the reboiler at the lower part of the continuous esterification reactor 2 enters, and the superheated n-butanol gas upwardly reacts with the pre-esterification material entering from the upper part on the catalyst reaction bed. The catalyst is titanium dioxide, and the amount of the catalyst added is phthalic anhydride. 5wt%, control the bottom temperature of the primary continuous esterifi...

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Abstract

The invention discloses a continuous esterification production method for a plasticizer. The method comprises the following steps of: mixing phthalic anhydride and an alcohol raw material according to the molar ratio of 1:(2.5-3.0), removing water at the temperature of between 150 and 180 DEG C, and thus obtaining a pre-esterification material; heating the alcohol raw material to obtain overheating alcohol gas; and allowing the pre-esterification material to continuously pass through at least two continuous esterification reactors which are connected in series with each other and are provided with catalyst reaction beds, continuously introducing the overheating alcohol gas into the continuous esterification reactors, and taking the plasticizer out of the bottom of the continuous esterification reactor at the tail end continuously. By the continuous esterification production method for the plasticizer, production time is greatly shortened, production efficiency is improved, a large quantity of labor power and material resources are saved, the conversion efficiency of raw materials is improved, the purity of a product is improved, energy consumption is reduced, and the raw materials are saved; and the method is environment-friendly.

Description

technical field [0001] The invention relates to the technical field of esterification synthesis, in particular to a continuous esterification production method of o-phthalic plasticizers. Background technique [0002] Plasticizer is an additive that increases the softness of materials or the liquefaction of materials. There are many kinds of plasticizers. In its research and development stage, there were more than 1,000 kinds of plasticizers. There are only more than 200 kinds of plasticizers produced as commodities. , and most of them are phthalates whose raw materials come from petrochemical industry. [0003] The existing production process of ortho-phthalic plasticizers in our country adopts batch esterification method. In the process, phthalic anhydride and alcohol are used for esterification reaction under the condition of catalyst. The reaction device adopts multiple reactors connected in series. After the reaction in the reactor is completely completed, the reactor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/80C07C67/08
Inventor 刘修华杨辉张建梅谭立文秦国栋
Owner WEIFANG YUANLI CHEM
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