Preparation method of dibutyl phthalate (DBP)

A technology of dibutyl phthalate and benzene, which is applied in the field of organic compound preparation, can solve the problems of wasting raw materials, incomplete reaction, and high production cost, and achieve the effects of good product quality, good environmental protection, and reduced energy consumption

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

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Problems solved by technology

At present, the use of dibutyl phthalate plasticizers in the market is very large, but in the production process, the production methods used in traditional industrial production are relatively complicated, the reaction is not complete, and there is waste of raw materials. Disadvantages of high cost

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  • Preparation method of dibutyl phthalate (DBP)
  • Preparation method of dibutyl phthalate (DBP)
  • Preparation method of dibutyl phthalate (DBP)

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Embodiment Construction

[0029] 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.

[0030] The purity of butanol and phthalic anhydride used in this embodiment are both = 99%.

[0031] A preparation method of dibutyl phthalate, comprising the following steps:

[0032] 1. Esterification process

[0033] 1. Raw material ratio

[0034] Phthalic anhydride Butanol Sulfuric acid Activated carbon Recycled alcohol

[0035] a. 1600kg 2400kg 9kg 5kg /

[0036] b. 1600kg 1700kg 9kg 5kg 875kg

[0037] 2. Prepare materials, check equipment, start

[0038] a. Put in the prepared butanol first, then turn on the blower to throw in phthalic anhydride, start stirring at the same time, then put ...

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Abstract

The invention discloses a preparation method of dibutyl phthalate (DBP). The preparation method comprises the following steps: adding the raw materials including phthalic anhydride and superfluous butanol 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 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 (butanol is recovered by using a supergravity bed and is reused). After activated carbon is added for decoloration, the finished product of DBP 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 butanol 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 dibutyl phthalate. Background technique [0002] Dibutyl phthalate is a colorless liquid. The relative density is 1.045 (21°C). The boiling point is 340°C. Insoluble in water, soluble in organic solvents such as ethanol and ether. It is a commonly used plasticizer for plastics, synthetic rubber, artificial leather, etc. It is also a solvent and fixative for spices, and can be used as a sanitation pest repellant. At present, the use of dibutyl phthalate plasticizers in the market is very large, but in the production process, the production methods used in traditional industrial production are relatively complicated, the reaction is not complete, and there is waste of raw materials. The disadvantage of high cost. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiency of prior art, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C69/80C07C31/12C07C29/82
CPCC07C67/08C07C29/82
Inventor 池银萍
Owner 池银萍
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