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Preparation method of diisobutyl phthalate

A technology of diisobutyl phthalate and isobutanol, which is applied in the field of preparation of diisobutyl phthalate, can solve the problems of harmful crops, unfavorable crop growth, unsuitable and other problems, and achieves no by-products, good The effect of industrial application value and short reaction cycle

Inactive Publication Date: 2016-01-13
DANYANG CITY AUX CHEM PLANT
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Problems solved by technology

This product should not be used as a plasticizer for the manufacture of agricultural films, because it is harmful to crops and is not conducive to crop growth

Method used

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  • Preparation method of diisobutyl phthalate
  • Preparation method of diisobutyl phthalate

Examples

Experimental program
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Embodiment

[0028] Example: such as figure 1 Shown, the preparation method of this diisobutyl phthalate comprises the following steps:

[0029] (1) Preliminary preparation: Weigh the raw materials in proportion, and test the reaction equipment; the raw materials are composed of the following ingredients in parts by weight: 6000KG of phthalic anhydride, 6000KG of isobutanol and 30KG of sulfuric acid;

[0030] (2) Esterification reaction: Put the weighed raw materials into the esterification kettle, and heat to 140°C for esterification reaction; after 2 hours of reaction, add 2500KG of isobutanol. When replenishing isobutanol, the temperature is controlled at 135°C. Alcohol supplementation time is 1h; esterification reaction time is 8h, after the reaction, take a sample to test the acidity value; after the esterification reaction, the acidity value is 0.3KOHmg / g up to the standard.

[0031] (3) Neutralization reaction: transport the material whose acid value reaches the standard after the ...

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Abstract

The invention discloses a preparation method of diisobutyl phthalate. The method comprises the following steps: 1, early stage preparation; 2, esterification reaction; 3, neutralization reaction; 4, dealcoholysis and decolorizing reaction; and 5, press filtration and packaging. In the above technical scheme, phthalic anhydride and isobutanol undergo a reaction with concentrated sulfuric acid as a catalyst to synthesize the diisobutyl phthalate plasticizer. The method has the advantages of simple and controllable process, high reaction efficiency, no byproducts, high output, good economic benefit, short reaction cycle, mild reaction conditions, good industrial application values, satisfactory recycling of wastewater and waste residues, and raw material saving.

Description

technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, and in particular relates to a preparation method of diisobutyl phthalate. Background technique [0002] Plasticizer, also known as plasticizer. It is a polymer material additive widely used in industry. Adding this substance in plastic processing can make it more flexible, easy to process, and can be legally used for industrial purposes. Among them, the most cost-effective phthalates (also called phthalates) are the most widely used, with an annual global usage of more than 8 million tons, of which phthalate plasticizers are the mainstay, accounting for 75 % share. Among them, diisooctyl phthalate (DEHP) is the most produced, followed by dibutyl phthalate (DBP). [0003] Diisobutyl phthalate, also known as diisobutyl phthalate (English name Diisobutylphthalate; phthalicaciddiisobutylester); 1,2-benzenedicarboxylic diisobutylester; 1,2-benzenediisobutylester Di(2-me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C67/52C07C69/80
CPCC07C67/08C07C67/52C07C69/80
Inventor 荆文平唐慧建王振华杨志刚
Owner DANYANG CITY AUX CHEM PLANT
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