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Catalyst for preparing acrylic acid and methyl acrylate

A methyl acrylate and catalyst technology, which is applied in molecular sieve catalysts, physical/chemical process catalysts, carboxylate preparations, etc., can solve the problems of unsatisfactory large-scale production, easy loss of active components, and complex influencing factors, so as to reduce production Maintenance costs, improved activity and stability, and simple industrial preparation

Active Publication Date: 2018-06-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the catalysts used in the above studies are basic catalysts or acid-base bifunctional catalysts. The preparation process generally uses methods such as impregnation, ion exchange, and co-precipitation to load the active components on the carrier. There are cumbersome preparations, complex influencing factors and The shortcomings of low repeatability and easy loss of active ingredients cannot meet the needs of industrial mass production

Method used

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  • Catalyst for preparing acrylic acid and methyl acrylate
  • Catalyst for preparing acrylic acid and methyl acrylate
  • Catalyst for preparing acrylic acid and methyl acrylate

Examples

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Effect test

Embodiment 1

[0055] The preparation of embodiment 1 catalyst

[0056] Pseudoboehmite (SB powder), silicon oxide, magnesium oxide, titanium oxide, kaolin and montmorillonite (purchased from Shanghai Zhuoyue Chemical Technology Co., Ltd.) were selected as binders. The specific indicators of the binder are shown in Table 1. With comparative example 1 to 3 identical ZSM-5, MOR, Y molecular sieve (concrete consumption sees table 2) and binding agent (concrete consumption sees table 2) and 10% dilute nitric acid are mixed and extruded and formed, after roasting, Exchanged with 0.5mol / L ammonium nitrate three times (2 hours / time), washed with deionized water, dried, and calcined at 550°C for 4 hours to obtain the catalyst, see Table 2.

[0057] Table 1 Binder specific indicators

[0058] Binder type

Mesopore specific surface area of ​​the binder (m 2 / g)

Metal impurity content in binder (wt%)

Pseudoboehmite

250

0.1

SB powder

289

0.2

Silicon ox...

Embodiment 2

[0061] Embodiment 2: the reaction performance of catalyst

[0062] Granulate D1#~D3# and 4#~12# catalysts into 20-40 mesh. 0.4 g of the catalyst was filled into a fixed-bed reactor for pretreatment. Catalyst pretreatment conditions are: N 2 The flow rate is 30mL / min, starting from 25°C over 150min to 500°C, and maintaining at 500°C for 180min.

[0063] The reaction gas is composed of two channels, one of which is the raw material methylal, which is brought into the reactor by CO under the condition of a water bath temperature of 30°C; the other is pure CO. By adjusting the amount and ratio of the above two paths of gas, different carbon monoxide: formaldehyde ratios, total reaction pressure, reaction temperature, space velocity, catalyst conditions and reaction results are listed in Table 3. Among them, the raw materials of formaldehyde compounds with test numbers 11, 12, and 13 in Table 3 are: formaldehyde, paraformaldehyde, and a mixture of formaldehyde and methylal in a ...

Embodiment 3

[0068] Pseudoboehmite, silicon oxide, magnesium oxide, titanium oxide, kaolin and montmorillonite were selected as binders respectively. The specific composition of the binder is shown in Table 4. ZSM-5, ZSM-35 and EMT molecular sieves with different silicon-aluminum ratios (all purchased from Shanghai Zhuoyue Chemical Technology Co., Ltd.) and binders with different mass fractions were mixed evenly with 10% dilute nitric acid and extruded into strips. After roasting, Exchanged with 0.5 mol / L ammonium nitrate three times (2 hours / time), washed with deionized water, dried, and calcined at 550° C. for 4 hours to obtain the catalyst. 0.4 g of the catalyst was filled into a fixed-bed reactor for pretreatment. Catalyst pretreatment conditions are: N 2 The flow rate is 30mL / min, starting from 25°C over 150min to 500°C, and maintaining at 500°C for 180min. The reaction gas is composed of three channels, and the total flow rate is guaranteed to be 100mL / min. The raw material methyl...

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Abstract

The invention relates to a catalyst for preparing acrylic acid and / or methyl acrylate from compounds containing carbon monoxide and a formaldehyde compound. The catalyst contains an acidic molecular sieve and a mesoporous binder; the formaldehyde compound is selected from at least one of formaldehyde, methylal and trioxymethylene; the mesoporous binder is selected from at least one of mesoporous silica, mesoporous magnesium oxide, mesoporous titanium oxide, mesoporous pseudo-boehmite, mesoporous kaolin and mesoporous montmorillonite.

Description

technical field [0001] The invention relates to a catalyst for preparing acrylic acid and methyl acrylate. Background technique [0002] Acrylic acid and methyl acrylate are important chemical raw materials, which can be used as coatings, flocculants, dispersants and binders, and are widely used in construction, water treatment, daily chemical, soil treatment and leather industries. People's daily life is closely related. At present, the most commonly used method in the industry to prepare acrylic acid and methyl acrylate is the two-stage oxidation of propylene, that is, the first step of oxidizing propylene to acrolein, and further oxidation to obtain acrylic acid. However, the raw material propylene comes from petroleum, which is a non-renewable resource and does not conform to the concept of sustainable development. [0003] With the rapid development of C1 chemistry, there is an overcapacity of acetic acid and methyl acetate. The preparation of acrylic acid and methyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/04B01J29/10B01J29/46B01J29/72C07C51/353C07C57/04C07C67/08C07C69/54
CPCB01J29/044B01J29/10B01J29/46B01J29/7215B01J29/7238C07C51/353C07C67/08C07C57/04C07C69/54
Inventor 石磊倪友明朱文良刘勇刘红超刘中民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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