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Catalyzer synthesized from ethyl lactate and hydrogen in use for 1, 2 propylene glycol, and preparation method

A technology of ethyl lactate and catalyst, which is applied in the chemical industry, can solve problems such as high equipment requirements, environmental damage, and polymerization, and achieve the effects of simple preparation process, less side reactions, and low energy consumption

Inactive Publication Date: 2004-10-27
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ester hydrogenation generally needs to be carried out at high temperature (200-300°C) and high pressure (20-30MPa), and Cr-containing catalysts are often used, such as Cu-Cr, Zn-Cr, etc., which not only require high equipment, but also require damage to the environment
In addition, lactic acid esters contain carboxyl and hydroxyl active groups, and high reaction temperatures will lead to side reactions such as transesterification, polymerization, and dehydration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A certain amount of carrier Al 2 o 3 Immerse in 3mol / L KBH 4 After 10 minutes in solution, decant the supernatant; place the soaked KBH 4 Al 2 o 3 Carrier added to RuCl 3 ·3H 2 O solution, react until no bubbles come out. The obtained solid was washed with water to neutrality, washed three times with absolute ethanol, and dried under vacuum at room temperature to obtain a ruthenium boron catalyst. Add 2.0 g of the above catalyst, 5 ml of ethyl lactate and 30 ml of n-heptane into a stainless steel autoclave with magnetic stirring. The reaction system was replaced three times with 1.0MPa hydrogen gas, and hydrogen gas was introduced. When the temperature reached 4.0MPa, the temperature began to rise. When the temperature rose to the required temperature of 140°C, the pressure was adjusted to 5.0MPa, and the stirring was started to start the reaction. React for 10 hours. The composition of the reaction mixture was analyzed by gas chromatography. The results are s...

Embodiment 2

[0025] The required amount of carrier Al 2 o 3 Immerse in 3mol / LKBH 4 solution for 15 minutes, decant the supernatant, and place the soaked KBH 4 Al 2 o 3 Carrier added to RuCl 3 ·3H 2 O and SnCl 2 2H 2 In the mixed solution of O, react until no bubbles come out. The obtained solid was washed with water to neutrality, washed three times with absolute ethanol, and dried under vacuum at room temperature to obtain a ruthenium boron catalyst. 2.5g of the above catalyst, 5ml of ethyl lactate and 40ml of n-heptane were added into the autoclave. The reaction system was replaced three times with 1.0 MPa hydrogen gas, and hydrogen gas was introduced. Start to heat up at 4.5MPa. When the temperature rises to the required temperature of 150°C, adjust the pressure to 6.0MPa, turn on the stirring, and start the reaction. React for 13 hours. The composition of the reaction mixture was analyzed by gas chromatography. The results are shown in Table 1.

Embodiment 3

[0027] Immerse the required amount of carrier activated carbon into 3mol / LKBH 4 solution for 20 minutes, decant the supernatant, and place the soaked KBH 4 The activated carbon support was added to the RuCl 3 ·3H 2 O and FeCl 3 ·6H 2 In the mixed solution of O, react until no bubbles come out. The obtained solid was washed with water until neutral, washed three times with absolute ethanol, and dried under vacuum at room temperature to obtain a ruthenium-boron catalyst. 1.5 g of the above catalyst, 5 ml of ethyl lactate and 20 ml of n-heptane were added into the autoclave. The reaction system was replaced three times with 1.0 MPa hydrogen gas, and hydrogen gas was introduced. Start to heat up at 4.0MPa. When the temperature rises to the desired temperature of 160°C, adjust the pressure to 5.5MPa, turn on the stirring, and start the reaction. React for 10 hours. The composition of the reaction mixture was analyzed by gas chromatography. The results are shown in Table 1....

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Abstract

A catalyst for synthesizing 1,2-propanediol by hydrogenating ethyl lactate contains Ru as active component, potassium (or sodium) borohydride as reducer, and carrier or not, and is prepared by improved chemical reduction method. Its advantages are high activity and selectivity, simple post-treating, and no environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a catalyst for synthesizing 1,2-propanediol through hydrogenation reaction under mild conditions by taking ethyl lactate as a raw material and a preparation method thereof. technical background [0002] 1,2-Propanediol is an important chemical raw material, mainly used as a raw material for the production of unsaturated resins, epoxy resins, polyurethane resins, etc., and can also be used as a raw material for the production of plasticizers, surfactants, emulsifiers and demulsifiers raw material. In the food industry, propylene glycol can be used as a spice, a solvent for food coloring, an antifungal agent, a food emulsifier, and a fruit ripening preservative. In the pharmaceutical industry, propylene glycol is commonly used as a solvent, emollient and excipient in the manufacture of various ointments, salves and pills. In the cosmetic industry, propylene ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01J23/58B01J23/60B01J23/652B01J23/89C07C29/136C07C31/20
Inventor 罗鸽阎世润乔明华范康年
Owner FUDAN UNIV
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