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Method for preparing dibutyl phthalate

A technology of dibutyl phthalate and phthalic anhydride, which is applied in the production field of dibutyl phthalate, can solve problems such as difficult control of product quality, pollution of three wastes, side reactions, etc., and achieve short reaction time , Reduce waste water discharge, fast response effect

Inactive Publication Date: 2011-05-18
陈雨
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Problems solved by technology

[0006] DBP is mainly used in the processing of polyvinyl chloride to make the product have good flexibility. Its traditional synthesis method is to use H 2 SO 4 As a catalyst, it is synthesized with phthalic anhydride and n-butanol. This method is cheap, high in activity, low in reaction temperature, mature in process, and high in product yield. However, it also has a series of side reactions caused by oxidative dehydration of alcohol by concentrated sulfuric acid. , serious corrosion, and the three wastes pollution and product quality are difficult to control and other shortcomings

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  • Method for preparing dibutyl phthalate
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  • Method for preparing dibutyl phthalate

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[0015] The process steps of the present invention are: in a 250mL three-neck flask equipped with a stirrer, a thermometer, and a reflux condenser, add phthalic anhydride and n-butanol with a molar ratio of 1:2 to 1:3, and then add a catalyst for trioxidation Dialuminum 0.3-1.2%, heating and stirring with electric heating mantle, reflux reaction at 140-240°C for 3-4 hours; after the reaction, filter out the catalyst, distill n-butanol, and then distill with water steam to remove excess alcohol ; The crude product after dealcoholization is separated, filtered and vacuum distilled to obtain the product, and the refractive index of the product is measured.

[0016] The reaction equation is:

[0017]

[0018] As a preferred solution, the process steps of the present invention are as follows: the molar ratio of phthalic anhydride and n-butanol is 1:3, the reaction temperature is 180-210°C, the reaction time is 3-4h, and the catalyst consumption is the total mass of the system 0....

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Abstract

The invention provides a method for preparing dibutyl phthalate, relates to a method for preparing a plasticizer, and in particular relates to a method for preparing the dibutyl phthalate. The method for preparing the dibutyl phthalate has the advantages of short time consumption, small pollution and excellent product quality. The method comprises the following steps: adding phthalic anhydride and n-butyl alcohol in the molar ratio of 1:2-1:3 into a 250mL three-neck flask which is filled with a mixer, a thermometer and a reflux condenser; adding 0.3 to 1.2 percent of catalyst aluminum oxide; heating by an electric jacket, and stirring; refluxing for 1 to 4 hours at the temperature of between 140 and 240 DEG C; filtering the catalyst after the reaction is finished, distilling the n-butyl alcohol, and distilling with water vapor, and removing excess alcohol; and preparing the product by the dealcoholized coarse product through separation, filtering and reduced pressure distillation, and detecting the refractive index of the product.

Description

Technical field: [0001] The present invention relates to a kind of production method of plasticizer, more specifically, relate to the production method of dibutyl phthalate. Background technique: [0002] Phthalate plasticizers are currently the main plasticizers that are most widely used and have the largest output. They have the advantages of light color, low toxicity, good electrical properties, low volatility, and low odor. They are widely used in plastics. Its total consumption accounts for more than 80% of the total consumption of plasticizers. [0003] Dibutyl phthalate (DBP) is a colorless, non-toxic, transparent liquid with an aromatic smell. It has good solubility for various resins and is one of the most widely used plasticizers. Its output accounts for my country's growth More than 20% of the total amount of plasticizer, its structural formula is shown in the figure below. [0004] [0005] Dibutyl phthalate [0006] DBP is mainly used in the processing of p...

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Application Information

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IPC IPC(8): C07C69/80C07C67/08B01J21/04
Inventor 陈雨
Owner 陈雨
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