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Dimethyl isophthalate and its production method

A technology of dimethyl isophthalate and a production method, which is applied to the field of dimethyl isophthalate and its production, can solve the problems of low product yield, high equipment requirements and high production cost, and achieves low reaction temperature , The effect of short esterification time and low production cost

Active Publication Date: 2022-04-01
山东清水化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The reaction process is longer;
[0005] (2) High requirements for equipment and high production costs;
[0006] (3) The product yield is low and the quality is poor

Method used

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  • Dimethyl isophthalate and its production method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1 A kind of dimethyl isophthalate and production method thereof

[0030] Include the following steps:

[0031] 1) Reaction: Weigh isophthalic acid, methanol and catalyst in the reaction kettle for reaction;

[0032] The reaction is heated by steam, the temperature is 100-130°C, the pressure is 0.2-0.6MPa, and the reaction time is 3 hours;

[0033] The mass ratio of the isophthalic acid, methanol and concentrated sulfuric acid is 1:3-4:0.001-0.003;

[0034] The catalyst is concentrated sulfuric acid.

[0035] 2) Dealcoholization: Slowly open the alcohol steaming valve, gradually reduce the pressure and temperature in the reactor, and at a temperature of 100-130°C and a pressure of normal pressure, dealcoholize the product obtained in step 1) to obtain esterification feedstock and methanol;

[0036] The methanol is condensed by a condenser and recovered for future use.

[0037] 3) Alkali washing: Put the crude product obtained in step 2) into a neutralizat...

Embodiment 2

[0043] Embodiment 2 A kind of production method of dimethyl isophthalate

[0044] Include the following steps:

[0045] 1) Reaction: Weigh isophthalic acid, methanol and catalyst in the reaction kettle for reaction;

[0046] The reaction is heated by steam, the temperature is 100-102°C, the pressure is 0.2-0.25MPa, and the reaction time is 3 hours;

[0047] The mass ratio of the isophthalic acid, methanol and concentrated sulfuric acid is 1:3:0.001;

[0048] The catalyst is concentrated sulfuric acid.

[0049] 2) Dealcoholization: Slowly open the alcohol steaming valve, gradually reduce the pressure and temperature in the reactor, and at a temperature of 100-105°C and a pressure of normal pressure, dealcoholize the product obtained in step 1) to obtain esterification feedstock and methanol;

[0050] The methanol is condensed by a condenser and recovered for future use.

[0051] 3) Alkali washing: Put the crude product obtained in step 2) into a neutralization kettle, add ...

Embodiment 3

[0057] Embodiment 3 A kind of dimethyl isophthalate and production method thereof

[0058] Include the following steps:

[0059] 1) Reaction: Weigh isophthalic acid, methanol and catalyst in the reaction kettle for reaction;

[0060] The reaction is heated by steam, the temperature is 125-130°C, the pressure is 0.55-0.6MPa, and the reaction time is 3 hours;

[0061] The mass ratio of the isophthalic acid, methanol and concentrated sulfuric acid is 1:4:0.003;

[0062] The catalyst is concentrated sulfuric acid.

[0063] 2) Dealcoholization: Slowly open the alcohol steaming valve, gradually reduce the pressure and temperature in the reactor, and at a temperature of 125-129.5°C and normal pressure, dealcoholize the product obtained in step 1) to obtain esterification feedstock and methanol;

[0064]The methanol is condensed by a condenser and recovered for future use.

[0065] 3) Alkali washing: Put the crude product obtained in step 2) into a neutralization kettle, add 5-8%...

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Abstract

The invention provides a kind of dimethyl isophthalate and production method thereof, described production method, comprises reaction, dealcoholization, alkali washing and rectifying steps; Described reaction, take reactant and catalyzer, reaction temperature is 100 -130°C, the pressure is 0.2-0.6MPa; the reactants are isophthalic acid and methanol, and the mass ratio of the isophthalic acid, methanol and catalyst is 1:3-4:0.001-0.003; the present invention method, the reaction temperature of the whole production process is low and the esterification time is short, which reduces energy consumption and saves energy; the dimethyl isophthalate produced by the production method of the present invention has a purity of ≥99.7%, a moisture content of ≤1000ppm, and an acid value of ≤0.1KOH / g.

Description

technical field [0001] The invention relates to dimethyl isophthalate and a production method thereof, belonging to the field of fine chemicals. Background technique [0002] The existing production method is that isophthalic acid and methanol are reacted with toluene or cyclohexane as a water-carrying agent under the catalysis of sulfuric acid. This method increases the process of separating the water-carrying agent, and a part of the material is brought out with the water-carrying agent to increase consumption. In addition, the existence of the water-carrying agent also affects the quality of the product. The purity of the product produced by this method can only reach 99.5%. [0003] The prior art has the following deficiencies when producing dimethyl isophthalate: [0004] (1) The reaction process is longer; [0005] (2) High requirements for equipment and high production costs; [0006] (3) The product yield is low and the quality is poor. Contents of the inventio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/80C07C67/08C07C67/54
CPCC07C67/08C07C67/54C07C69/80
Inventor 宋培剑
Owner 山东清水化工有限公司
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