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Catalyst for producing acroleic acid by lactic acid dewatering and reaction technique

A catalyst and acrylic acid technology, applied in molecular sieve catalysts, physical/chemical process catalysts, carboxylate preparation, etc., can solve the problems of low conversion rate and yield of lactate reaction

Inactive Publication Date: 2009-01-28
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this type of catalyst is that the conversion and yield of the lactate reaction are too low, and the use of additives

Method used

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  • Catalyst for producing acroleic acid by lactic acid dewatering and reaction technique
  • Catalyst for producing acroleic acid by lactic acid dewatering and reaction technique
  • Catalyst for producing acroleic acid by lactic acid dewatering and reaction technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Weigh 4g of HZSM-5 (Si / Al=30) powder, add it into 84.9ml KCl solution with a concentration of 0.2mol / L, stir evenly, and let it stand at room temperature for 24 hours. Then remove the clear liquid part, and dry the remaining emulsion part overnight at 100 °C, and then bake it in a muffle furnace at 450 °C for 4 hours to obtain K 2 K-HZSM-5 catalyst with calculated O content of 20 wt%. After the catalyst was tableted and granulated, the 30-mesh particles were screened for the reaction of lactic acid dehydration to acrylic acid.

[0011] The middle part of the quartz tube fixed-bed reactor with a length of 30 cm is filled with catalyst, and the height of the catalyst bed is 3 cm. The space above the catalyst bed in the reaction tube is filled with 30-mesh quartz sand. The carrier gas nitrogen with a flow rate of 20ml / min was introduced to keep the pressure at 0.4MPa. A lactic acid solution with a concentration of 30wt% was introduced into the reaction tube with a micro...

Embodiment 2

[0016] Weigh 4g of HZSM-5 (Si / Al=30) powder and add it into 267.7ml of lithium nitrate solution with a concentration of 0.2mol / L, stir evenly, and let it stand at room temperature for 24 hours. Then the clear liquid part was removed, and the remaining emulsion part was dried overnight at 100 °C, and then baked in a muffle furnace at 450 °C for 4 hours to obtain Li 2 Li-HZSM-5 catalyst with a calculated O content of 20 wt%. After the catalyst was tableted and granulated, the 30-mesh particles were screened for the reaction of lactic acid dehydration to acrylic acid. The reaction conditions are the same as in Example 1, and the results are shown in Table 2.

[0017] Table 2 The reaction results of lactic acid dehydration to acrylic acid at different reaction temperatures on Li-HZSM-5 catalyst

[0018]

[0019] *Other products are mainly 2-butyraldehyde, acetone, hydroxyacetone and polylactic acid.

Embodiment 3

[0021] Prepare K-HZSM-5 catalyst according to embodiment 1. Lactic acid catalytic dehydration reaction conditions: except that the reaction temperature was fixed at 350° C. and different reaction times were used, the others were the same as in Example 1. The reaction results are shown in Table 3.

[0022] Table 3 The reaction results of lactic acid dehydration to acrylic acid with different reaction times on K-HZSM-5 catalyst

[0023]

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Abstract

The invention relates to a catalyst for preparing acrylic acid from lactic acid dehydration and a reaction technology thereof. The catalyst comprises an inorganic porous material vector and an active metal component with 1wt% to 50wt% (calculated in the form of oxide), wherein, the inorganic porous material vector is one of silica-aluminum molecular sieve, phosphorous-aluminum molecular sieve, silica-phosphorous-aluminum molecular sieve and mesoporous material, and the active metal component is one of or a plurality of materials combined according to the random ratio such as IA, IIA, IIB, VIB, VIIB, VIIIB and rare earth elements. The catalyst is prepared in a way that the inorganic porous material vector is impregnated and loaded into the solution of soluble salt or hydroxide which contains active metal. The reaction of preparing acrylic acid from lactic acid dehydration is carried out in a fixed-bed flow-typed reactor which is filled with the catalyst; lactic acid which has 10-100% of concentration is directly put into the reactor to carry out catalytic dehydration at 280 DEG C to 400 DEG C without preheating gasification, so as to obtain 100% of lactic acid conversion rate and over 63% of acrylic acid selectivity.

Description

technical field [0001] The invention relates to a catalyst and a reaction process for preparing acrylic acid from lactic acid dehydration. Background technique [0002] Acrylic acid is an extremely important bulk chemical, mainly used as a polymer monomer and a basic organic chemical raw material. It has extremely extensive and important applications in chemical industry, water treatment, oil recovery, metallurgy and other fields. At present, acrylic acid is produced industrially using petroleum products as raw materials, and the developed process routes mainly include: 1) cyanohydrin method (Rohm&Hass Company, Germany, 1937)-at a temperature of 175°C, sulfuric acid is used as a catalyst to hydrolyze cyanoethanol Acrylic acid is produced. This method is the earliest industrial production method, but due to the existence of expensive raw materials, low yield of acrylic acid (60-70%), serious environmental pollution in the production process, and the by-products contain a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C57/065C07C51/347
Inventor 晁自胜凡美莲李立军
Owner HUNAN UNIV
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