Method for preparing monoisopropanolamine

A technology of isopropanolamine and propylene glycol, which is applied in the field of preparation of isopropanolamine, can solve the problems of low conversion rate of raw materials, harsh reaction conditions, and low yield of products, and achieve the increase of alkaline sites, decrease of acidity, and reduction of dehydration The effect of side effects

Active Publication Date: 2020-12-25
WANHUA CHEM GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (1) The process of synthesizing isopropanolamine with ammonia water or liquid ammonia and propylene oxide as raw materials has the problems of harsh reaction conditions, low product yield, poor selectivity and high energy consumption for separation
[0010] (2) The process of synthesizing alcohol amines by alcohol-catalyzed amination reaction has the problems of low conversion rate of raw materials, low product yield and poor selectivity
[0011] Therefore, it is urgent to find a suitable production process to fundamentally solve the problems of low conversion rate of raw materials, low product yield and poor selectivity. At the same time, through continuous optimization of process conditions, the purpose of improving production efficiency and product quality is achieved.

Method used

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  • Method for preparing monoisopropanolamine
  • Method for preparing monoisopropanolamine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] (1) γ-Al 2 o 3 carrier modification

[0067] Using equal volume impregnation method, 300g γ-Al 2 o 3 Add it into 300ml aqueous solution containing 9.0g of tetrahydropyrrole, and after adsorption equilibrium, dry at 120°C for 5h, and roast at 300°C for 4h to obtain a modified γ-Al2O3 carrier.

[0068] (2) 5%CuO-5%PdO-0.5%Bi 2 o 3 -0.5%In 2 o 3 / Preparation of modified γ-Al2O3 catalyst

[0069] Using the equal volume impregnation method, the 100g modified γ-Al2O3 support obtained in step (1) was added to the carrier containing 15.2g Cu(NO 3 ) 2 ·3H 2 O, 9.41gPd(NO 3 ) 2 2H 2 O, 1.04g Bi(NO 3 ) 3 ·5H 2 O and 1.15g In(NO 3 ) 3 ·H 2 In 100ml aqueous solution of O, after adsorption equilibrium, dry at 130°C for 4h, and roast at 400°C for 5h to get 5%CuO-5%PdO-0.5%Bi 2 o 3 -0.5%In 2 o 3 / Modified γ-Al2O3 catalyst.

[0070] (3) 5%NiO-2%V 2 o 5 -0.4%Y 2 o 3 / Preparation of modified γ-Al2O3 catalyst

[0071] Using the equal volume impregnation metho...

Embodiment 2

[0121] (1) γ-Al 2 o 3 carrier modification

[0122] Using equal volume impregnation method, 300g γ-Al 2 o 3 Add it into 300ml aqueous solution containing 21.0g of tetrahydropyrrole, and after adsorption equilibrium, dry at 140°C for 4h, and roast at 400°C for 5h to obtain a modified γ-Al2O3 carrier.

[0123] (2) 6%CuO-4%PdO-3%Bi 2 o 3 -0.2%In 2 o 3 / Preparation of modified γ-Al2O3 catalyst

[0124] Using the equal volume impregnation method, the 100g modified γ-Al2O3 support obtained in step (1) was added to the carrier containing 18.2g Cu(NO 3 ) 2 ·3H 2 O, 7.53gPd(NO 3 ) 2 2H 2 O, 6.25g Bi(NO 3 ) 3 ·5H 2 O and 0.46g In(NO 3 ) 3 ·H 2 In 100ml aqueous solution of O, after adsorption equilibrium, dry at 140°C for 6h, and roast at 350°C for 4h to get 6%CuO-4%PdO-3%Bi 2 o 3 -0.2%In 2 o 3 / Modified γ-Al2O3 catalyst.

[0125] (3) 4%NiO-1%V 2 o 5 -0.1%Y 2 o 3 / Preparation of modified γ-Al2O3 catalyst

[0126] Using the equal volume impregnation method, ...

Embodiment 3

[0134] (1) γ-Al 2 o 3 carrier modification

[0135] Using equal volume impregnation method, 300g γ-Al 2 o 3 Add it into 300ml aqueous solution containing 15.0g piperidine, after adsorption equilibrium, dry at 130°C for 6h, and roast at 500°C for 6h to obtain modified γ-Al2O3 carrier.

[0136] (2) 7%CuO-3%PdO-2.5%Bi 2 o 3 -0.15%In 2 o 3 / Preparation of modified γ-Al2O3 catalyst

[0137] Using the equal volume impregnation method, add the 100g modified γ-Al2O3 carrier obtained in step (1) into the carrier containing 21.3g Cu(NO 3 ) 2 ·3H 2 O, 5.65gPd(NO 3 ) 2 2H 2 O, 5.21g Bi(NO 3 ) 3 ·5H 2 O and 0.34g In(NO 3 ) 3 ·H 2 In 100ml aqueous solution of O, after adsorption equilibrium, dry at 120°C for 3h, and roast at 300°C for 6h to obtain 7%CuO-3%PdO-2.5%Bi 2 o 3 -0.15%In 2 o 3 / Modified γ-Al2O3 catalyst.

[0138] (3) 3%NiO-3%V 2 o 5 -0.5%Y 2 o 3 / Preparation of modified γ-Al2O3 catalyst

[0139] Using the equal volume impregnation method, the 100g mo...

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Abstract

The invention discloses a method for preparing monoisopropanolamine. The method comprises the steps of (a) reacting 1,2-propylene glycol under the action of a dehydrogenation catalyst to obtain 2-hydroxy propionaldehyde; and (b) reacting the 2-hydroxy propionaldehyde obtained in the step (1) with liquid ammonia and hydrogen under the action of a hydrogenation catalyst to prepare monoisopropanolamine. The dehydrogenation catalyst is prepared from a modified gamma-Al2O3 carrier and active components of CuO, PdO, Bi2O3 and In2O3. The hydrogenation catalyst comprises a modified gamma-Al2O3 carrierand active components NiO, V2O5 and Y2O3. Different catalysts and two-step reaction processes are adopted, and the reaction processes of dehydrogenation, imidization and hydrogenation of 1,2-propanediol are controlled to inhibit the generation of by-products such as hydroxyacetone in the dehydrogenation process and by-products such as secondary amine in the amination process, thereby greatly enhancing the yield and selectivity of the monoisopropyl alcohol product.

Description

technical field [0001] The invention relates to the fields of organic synthesis and catalysts, in particular to a preparation method of monoisopropanolamine. Background technique [0002] Isopropanolamines include monoisopropanolamine (1-amino-2-propanol, referred to as MIPA), diisopropanolamine (2,2'-dihydroxydipropylamine, referred to as DIPA) and triisopropanolamine ( 1,1,1'-nitrilotri-2-propanol, referred to as TIPA) three homologue products. Wherein, one isopropanolamine is 1-amino-2-propanol (chemical formula: CH 3 CH(OH)CH 2 NH 2 ), also known as monoisopropanolamine. Monoisopropanolamine has a wide range of uses: it can be used in daily chemicals such as detergents, liquid detergents, and shampoos; it can be used in fabrics, wool spinning, and leather auxiliaries; it can be used in cleaning agents for metal electronic liquid crystals and semiconductors; It can be used in the synthesis of medicines, pesticides and flavors and fragrances intermediates. [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C213/02C07C249/02C07C45/00B01J35/10B01J23/89B01J23/847B01J23/00C07C215/08C07C251/08C07C47/19
CPCC07C213/02C07C249/02C07C45/002B01J23/002B01J23/8973B01J23/8472B01J35/1019B01J35/1042B01J2523/00C07C215/08C07C251/08C07C47/19B01J2523/17B01J2523/31B01J2523/33B01J2523/54B01J2523/824B01J2523/36B01J2523/55B01J2523/847Y02P20/584
Inventor 任树杰张聪颖李昱学刘帅刘宝现尚永华
Owner WANHUA CHEM GRP CO LTD
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