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Preparation method of dioctyl terephthalate and used catalyst

A technology of dioctyl terephthalate and dioctyl phthalate is applied in the field of catalysts for synthesizing dioctyl terephthalate, and can solve the problem of long catalyst catalysis time, darkening of product color, easy yellowing of products, etc. problem, to achieve the effect of recyclable post-processing separation, improving conversion rate, and convenient post-processing separation

Inactive Publication Date: 2012-12-19
FOSHAN GAOMING XIONGYE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its price is relatively low, and the reaction temperature is below 180°C, but this type of catalyst takes a long time to catalyze, seriously corrodes the equipment, and also has side reactions such as oxidation and carbonization, resulting in darker color of the product and difficulty in post-processing
Another commonly used catalyst is titanate, which requires a long reaction time, the product is easy to yellow, and its price is relatively expensive

Method used

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  • Preparation method of dioctyl terephthalate and used catalyst
  • Preparation method of dioctyl terephthalate and used catalyst
  • Preparation method of dioctyl terephthalate and used catalyst

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Embodiment Construction

[0036] The preparation method of dioctyl terephthalate, step is as follows,

[0037] Step 1: Put terephthalic acid and isooctyl alcohol into the esterification reaction kettle in a weight ratio of 1:2 to 1:3, and heat while stirring;

[0038] Step 2: When the temperature rises to 130~150°C (corresponding to temperature A in Table 3 below), add Catalyst 1 (see Table 1~2 below), the amount of which is terephthalic acid and isooctyl added in Step 1 1 ~ 8% of the total alcohol weight, continue to heat up;

[0039] Step 3: When the temperature rises to 160~220°C (corresponding to temperature B in Table 3 below), add Catalyst 2 (see Table 1~2 below), the amount of which is terephthalic acid and isooctyl added in Step 1 0.05~0.5% of the total weight of alcohol, then the esterification reaction temperature is controlled at 160-260°C (corresponding to the esterification reaction temperature C in the following table 3), and the reaction is 0.5~3 hours (corresponding to the reaction tim...

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Abstract

The invention provides a catalyst for use in synthesis of dioctyl terephthalate and a method for preparing dioctyl terephthalate by applying the catalyst. The catalyst consists of a catalyst 1 and a catalyst 2, wherein the catalyst 1 consists of an ionic liquid and a metal compound; the catalyst 2 consists of a titanium metal compound and other metal compound; the positive ion of the ionic liquid are an imidazole ion or a benzimidazole ion; the negative ion of the ionic liquid is a bisulfate ion; or the positive ion of the ionic liquid is a benzimidazole ion or an imidazole ion with one or two sulfonic acid radicals; the titanium metal compound is selected from at least one compound of tetrabutyl titanate, isopentyl ester titanate, isopropyl titanate or titanium dioxide; and the other compound is selected from at least one compound of dibutyldimethoxytin, dibutyltin oxide, monooctyl ester stannite, zinc acetate and cobalt acetate. Due to the adoption of the technical scheme provided by the invention, the cost can be reduced, the reaction speed is increased, energy consumption is lowered, and the quality of an obtained product is high.

Description

technical field [0001] The invention relates to a preparation method of dioctyl terephthalate and a catalyst for synthesizing dioctyl terephthalate. Background technique [0002] Dioctyl terephthalate (DOPT) is an important and excellent polyvinyl chloride (PVC) resin plasticizer with excellent chemical stability, heat resistance, cold resistance, low volatility and high insulation It can be widely used in the fields of cables, PVC plastics, high-grade artificial leather and rubber products. [0003] Currently, the commonly used synthetic route of DOPT is prepared by esterification of purified terephthalic acid (TPA) and isooctyl alcohol. Since TPA is basically immiscible with isooctyl alcohol, it is a typical heterogeneous esterification reaction with slow reaction rate and long reaction time. Factors affecting the reaction rate of TPA and iso-octanol mainly include stirring intensity, catalyst selection and dosage, feed ratio of TPA and octanol, reaction temperature and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/12B01J31/38C07C69/82C07C67/08
Inventor 吴志鹏
Owner FOSHAN GAOMING XIONGYE CHEM
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