Preparation method of dioctyl phthalate (DOP)

A technology of dioctyl phthalate and esterification, which is applied in the field of organic compound preparation, can solve the problems of incomplete reaction, high production cost, waste of raw materials, etc., and achieves good environmental protection significance, good product quality, and reduced energy consumption. Effect

Inactive Publication Date: 2014-10-01
池银萍
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, in the production process of dioctyl phthalate plasticizers on the market, the production methods adopted in traditional industrial production have the disadvantages of complicated process, incomplete reaction, waste of raw materials and high production cost.

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  • Preparation method of dioctyl phthalate (DOP)

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Embodiment Construction

[0027] In order to further illustrate the technical solution of the present invention, the preferred embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only to further illustrate the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0028] The purity of the used iso-octanol and phthalic anhydride in this embodiment=99%.

[0029] A preparation method of dioctyl phthalate, comprising the following steps:

[0030] 1. Esterification process

[0031] 1. Raw material ratio

[0032] Phthalic anhydride Isooctanol Sulfuric acid Activated carbon Recycled alcohol

[0033] a. 1600kg 2400kg 9kg 5kg 875kg

[0034] b. 1600kg 1700kg 9kg 5kg /

[0035] 2. Prepare materials, check equipment, start

[0036] a. Put in the prepared isooctyl alcohol first, then turn on the blower to throw phthalic anhydride, and start stirring at the same time,...

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Abstract

The invention discloses a preparation method of dioctyl phthalate (DOP). The preparation method comprises the following steps: adding the raw materials including phthalic anhydride and superfluous isooctyl alcohol to a reaction kettle, adding concentrated sulfuric acid as a catalyst, controlling the temperature in the reaction kettle to be 0-150 DEG C, reacting for 16-20 hours, neutralizing the catalyst and unreacted phthalic anhydride with an alkaline solution after the reaction is completed, standing for layering and then carrying out washing with clear water for several times. After alcohol-containing wastewater is collected, alcohols are recovered with a recovery tower and are reused. A lower ester layer after layering is heated to recover alcohols at reduced pressure (isooctyl alcohol is recovered by using a supergravity bed and is reused). After activated carbon is added for decoloration, the finished product of DOP is obtained through filter pressing by adopting a plate-and-frame filter press. The preparation method has the beneficial effects that the superfluous alcohol serves as a water-carrying agent, so that the esterification reaction is gradually carried through to the end, the technological process is simplified and the product quality is good; relative to a process of distillation in a rectifying tower, the preparation method has the advantages that the supergravity bed is used to recover isooctyl alcohol in the process, so that the energy consumption is effectively reduced and the process has better environment-friendly significance.

Description

technical field [0001] The invention relates to the field of preparation methods of organic compounds, in particular to a preparation method of dioctyl phthalate. Background technique [0002] Dioctyl phthalate (DOP) is currently the most widely used plasticizer, accounting for about 45% of the total plasticizers in my country. It is an important general-purpose plasticizer, and any plasticizer is based on it For comparison, it has an absolute advantage in technology and economy. It is insoluble in water and soluble in organic solvents such as ethanol and ether. It is a commonly used plasticizer for plastics, synthetic rubber, artificial leather, etc. At present, in the production process of dioctyl phthalate plasticizers on the market, the production methods adopted in traditional industrial production have the disadvantages of complicated process, incomplete reaction, waste of raw materials and high production cost. Contents of the invention [0003] The purpose of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/80C07C67/08
CPCC07C67/08
Inventor 池银萍
Owner 池银萍
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