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Method for preparing 1, 2-cyclohexane dioctyl phthalate diisooctyl by hydrogenation

A technology of diisooctyl cyclohexanedicarboxylate and diisooctyl phthalate is applied in the field of hydrogenation to prepare diisooctyl cyclohexanedicarboxylate, and can solve the problem of high reaction temperature and conversion problems such as low rate or selectivity, to achieve the effect of reducing reaction temperature and energy consumption

Inactive Publication Date: 2013-01-30
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current technology has the disadvantages of high reaction temperature and low conversion rate or selectivity of the reaction.

Method used

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  • Method for preparing 1, 2-cyclohexane dioctyl phthalate diisooctyl by hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The catalyst used is Pd-Ru / Al 2 o 3 . The weight composition of the catalyst is: Pd=0.5%, Ru=1%, and the rest is carrier Al 2 o 3 . The catalyst active components Pd and Ru were supported on the carrier Al by conventional impregnation method. 2 o 3 superior. 10 grams of catalyst is activated by hydrogen before the reaction, the activation conditions are: GHSV=1000~2000h -1 , Atmospheric pressure ~1.0MPa, 250~450℃, reduction time 5~12 hours. A trickle bed reactor is used. The reaction temperature is 175°C, the hydrogen pressure is 15MPa, the H2 / ester molar ratio is 600, and the volumetric space velocity of diisooctyl phthalate is 0.4h -1 ,, Reaction time 24h, sampling analysis. The analysis of products and raw materials adopts gas chromatography, and the specific conditions are: nitrogen is the carrier gas, the flow rate is 1.5mL / min., and the injection volume is 4 microliters; FID hydrogen flame ion detector, HP-5 column, column temperature 260°C.

Embodiment 2

[0023] The volume space velocity of diisooctyl phthalate is 0.3h -1 , other conditions are identical with embodiment 1.

Embodiment 3

[0025] The volume space velocity of diisooctyl phthalate is 0.5h -1 , other conditions are identical with embodiment 1.

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Abstract

The invention relates to a method for preparing 1, 2-cyclohexane dioctyl phthalate diisooctyl by hydrogenation. The method is characterized in that a reaction system consists of the components of: phthalic acid diisooctyl, hydrogen and catalyst; and the reaction condition is that the reaction temperature is 100-250 DEG C, the reaction pressure is 5-18MPa, the volume ratio between H2 and the phthalic acid diisooctyl is (2000-200):1, and the liquid air space velocity of the phthalic acid diisooctyl is 0.1-2.5h-1. The catalyst takes Al2O3 as a carrier, an active component is selected from one or a plurality out of Ru, Pd and Ni, and the bearing capacity of the active component is 1-3% of the weight of the catalyst; and the catalyst is subjected to in-situ reduction by the H2 and is activated before use.

Description

technical field [0001] The invention relates to a method for preparing 1,2-cyclohexanedicarboxylic acid dibasic ester by hydrogenating dibasic phthalate, in particular to converting diisooctyl phthalate into 1,2- Diisooctyl cyclohexanedicarboxylate process. Background technique [0002] The main products of plasticizers in my country are phthalates, among which di(2-ethylhexyl) phthalate (DOP or DEHP) and dibutyl phthalate (DBP) are the main products, especially Bis(2-ethylhexyl)phthalate accounts for about 70% of the total consumption. However, in recent years, various countries and regions have investigated the toxicity, carcinogenicity and biodegradability of phthalate plasticizers, and found that in long-term use, due to the influence of the benzene ring in the structure, the adjacent Phthalates have the disadvantages of carcinogenicity, teratogenicity, accumulation in the human body, and poor biodegradability. Therefore, the application fields of traditional plasticiz...

Claims

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Application Information

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IPC IPC(8): C07C69/75C07C67/303
Inventor 李孝国赵甲于海滨李佳裴仁彦孙国方张耀日费亚南
Owner CHINA NAT OFFSHORE OIL CORP
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