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Method for synthesizing epoxypropane

A technology of propylene oxide and epoxidation reaction, which is applied in organic chemistry, bulk chemical production, etc., can solve the problems of short catalyst life, short catalyst service life, and decreased catalyst activity, and achieve high selectivity, extended life, The effect of simple process

Active Publication Date: 2008-10-08
HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] US5675026 adopts the method of adding neutral or acid-reactive salts in the reaction system, such as Na 2 SO 4 , NH 3 , (NH 4 ) 2 SO 4 , Na 2 HPO 4 , NaH 2 PO 4 etc., the productive rate and the selectivity of propylene oxide are higher, but the activity of catalyst begins to decline when the reaction is carried out to 60h, the life-span of catalyst is short, needs frequent regeneration
[0006] US6300506B1 adjusts the pH of the solution to 5.5-8.0 by adding a buffer solution in the reaction system, and the yield and selectivity of propylene oxide are relatively high. 2 o 2 The conversion rate drops rapidly from 90% to 75%, and the catalyst life is short
[0007] Therefore, using hydrogen peroxide as an oxidant, the main problem in the synthesis of propylene oxide by titanium-silicon molecular sieve catalyzed propylene epoxidation is the short service life of the catalyst.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 60g of HTS was mixed with 20g of kaolin, 66g of silica sol, 5g of methylcellulose, 2ml of concentrated nitric acid and an appropriate amount of water, and then extruded into strands. The size of the catalyst was 2×2 mm.

Embodiment 2

[0024] The catalyst of Example 1 was installed in a fixed-bed reactor, the loading amount of the catalyst was 15 ml, and ceramic ring fillers were installed on the top and bottom of the catalyst. The reaction raw materials pass through the bed of resin first, then enter the fixed bed reactor, and analyze the conversion rate of hydrogen peroxide by sampling every 4 hours. Speed, then pH increases, and simultaneously increases reaction temperature, does not add surfactant in the reaction raw material, and experimental result is shown in Table 1. Table 1 shows that the catalyst has a long lifetime of 1218 hours.

[0025] Table 1 Effect of process condition optimization on catalyst

[0026]

Embodiment 3

[0028] The catalyst of Example 1 was installed in a fixed-bed reactor, the loading amount of the catalyst was 15 ml, and ceramic ring fillers were installed on the top and bottom of the catalyst. Add 0.90% Span 80 (Span) and 0.05% Tween 80 (Tween) to the reaction raw materials, and analyze the conversion rate of hydrogen peroxide by sampling every 4 hours. When the conversion rate of hydrogen peroxide drops below 88.5%, add ammonia water to increase the pH of the solution , while increasing the reaction temperature. The experimental results are shown in Table 3. It can be seen from Table 3 that the life of the catalyst is further extended by adjusting the pH of the solution, adjusting the reaction temperature and adding a surfactant.

[0029] Table 2 Effect of process condition optimization on catalyst

[0030] reaction

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PUM

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Abstract

The invention discloses a method to synthesize propylene oxide, which is characterized in that alcohol with low content of carbon, propylene and oxydol(mol ratio 1-15:0.5-5:1) are put into a reactor which is fed with catalyzer; the propylene and the oxydol react and produce propylene oxide, and the condition for the reaction includes: temperature 30-90 DEG C, pressure 0.5-4.5MPa, ph value of the solution 5,0-8.0, and airspeed of the solution 0.1-7h-1; wherein the temperature and ph value of the solution in the whole process are adjusted according to the conversion rate of the oxydol, and once the conversion rate of the oxydol drops to 88.5%, the ph value and the temperature of the solution are increased. The method is simple in process, mild in condition, the conversion rate of the oxydol is high and the propylene oxide is of selectivity; meanwhile, the life of the catalyzer is prolonged to over 1200h through the adjustment of the ph value and the temperature of the solution.

Description

1. Technical field [0001] The invention relates to a method for synthesizing propylene oxide, in particular to a method for synthesizing propylene oxide by using hydrogen peroxide as an oxidant and titanium silicon molecular sieves catalyzing the epoxidation reaction of propylene. 2. Background technology [0002] Propylene oxide is the third largest organic chemical product in the production of propylene derivatives after polypropylene and acrylonitrile. It is mainly used to produce polyether, propylene glycol, isopropanolamine, non-polyether polyols, etc., and then to produce unsaturated Polyester resin, polyurethane, surfactant, flame retardant and other important raw materials. [0003] Propylene oxide is produced by chlorohydrin method and co-oxidation method in the world. When the chlorohydrin method synthesizes propylene oxide, the equipment is seriously corroded and consumes a large amount of Cl 2 , produced a large amount of waste water and waste residue, which ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/12C07D303/04
CPCY02P20/52
Inventor 李华王伟林榕伟何驰剑伍小驹高计皂
Owner HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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