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Processing process of dioctyl terephthalate

A technology of dioctyl terephthalate and dioctyl phthalate, which is applied in the field of processing technology of dioctyl terephthalate, can solve the problem of high catalyst price, high requirements for reaction conditions, and unfavorable large-scale industrialization of environmental protection Development and other issues

Inactive Publication Date: 2017-01-04
浙江弘博新材料科技有限公司
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  • Summary
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AI Technical Summary

Problems solved by technology

In the above production process, the catalyst used is expensive and requires high reaction conditions, which is not conducive to environmental protection and large-scale industrialization.

Method used

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Embodiment Construction

[0021] The processing technology of the specific embodiment of the present invention dioctyl terephthalate comprises the following steps: 1. esterification reaction, adding 6800kg of terephthalic acid and 16500kg of isooctyl in the reactor in an amount of 1:2.25 by weight Alcohol, wherein 4650kg of iso-octanol is recycled alcohol, when adding iso-octanol into the reactor, the liquid temperature is 110°C when adding alcohol for the first time, the liquid temperature is 200°C when adding alcohol for the second time, and the liquid temperature is 215°C when adding alcohol for the third time ℃, after the material is added, carry out the esterification reaction without catalyst at normal pressure, 120-230 ℃, after 8 hours of reaction, raise the temperature to 225-235 ℃, when the liquid temperature is 175-180 ℃, add tetraisopropyl titanate 12.2kg of ester catalysts, the reaction is completed to obtain dioctyl terephthalate initial product 18000kg,

[0022] ②The initial product is su...

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Abstract

The invention discloses a processing process of dioctyl terephthalate. The processing process comprises the following steps that 1, terephthalic acid and isooctyl alcohol with the weight ratio being 1:(2-3) are adopted as main raw materials, an esterification reaction is carried out at normal pressure and the temperature of 120 DEG C to 230 DEG C, after reacting is carried out for 8 h to 10 h, the temperature is raised to 225 DEG C to 235 DEG C, a tetraisopropyl titanate catalyst is added, the amount of the catalyst is 0.05% of the sum of the amount of the main raw materials, and a primary product is obtained through reacting; 2, the primary product is subjected to vacuum flashing treatment; 3, a sodium carbonate solution is added into the primary product in the step 2 for reacting for 10 min, then water is continuously added for 15 min for washing, and drainage is carried out after sedimentation is carried out for 40 min; 4, after the primary product is subjected to acidity adjustment, water is introduced into a reaction still, the primary product is vaporized to form azeotrope with excessive alcohol, the product is discharged after condensation, and dealcoholization is carried out; 5, finally, finished dioctyl terephthalate is obtained through filtering. The process is simple in condition and high in finished product quality, and the reaction process is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of plasticizer processing methods, in particular to a processing technology of dioctyl terephthalate. Background technique [0002] Dioctyl terephthalate (DOTP) is a main plasticizer with excellent performance. It has the advantages of good extraction, softness and electrical insulation performance, and it shows excellent durability, soapy water resistance and low temperature softness in products, so its application range is very wide. For example, because of its low volatility, DOTP can fully meet the temperature resistance requirements of wire and cable, and can be applied to 70°C resistant cable materials (IEC standard of the International Electrotechnical Commission) and various other PVC soft products; With excellent compatibility, DOTP can also be used as a plasticizer in acrylonitrile derivatives, polyvinyl butyral, nitrile rubber, nitrocellulose, etc.; in addition, DOTP can also be used as a plastic...

Claims

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Application Information

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IPC IPC(8): C07C67/08C07C67/48C07C67/54C07C67/56C07C69/82
CPCC07C67/08C07C67/48C07C67/54C07C67/56C07C69/82
Inventor 罗加彬
Owner 浙江弘博新材料科技有限公司
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