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Oxidation method for olefin

A technology of olefins and oxidants, applied in chemical recovery, organic chemistry, etc., can solve the problems of catalyst activity and selectivity reduction, catalyst deactivation, catalyst activity and selectivity fluctuations, etc., to reduce regeneration frequency and prolong single-pass use Life and the effect of extending the stable operation time

Active Publication Date: 2016-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When titanium-silicon molecular sieves are used as catalysts, the common problem is that after a period of operation of the device, the activity and selectivity of the catalyst will decrease, that is, the catalyst will be deactivated during operation.
[0006] However, when the regenerated catalyst is put into operation again, especially after being regenerated in the device, the activity and selectivity of the catalyst fluctuate greatly, and it takes a long time to stabilize; at the same time, it is necessary to combine operations such as increasing the reaction temperature To achieve the smooth operation of the reaction, but this will further accelerate the deactivation of the catalyst and reduce the selectivity of the target oxidation product, affecting the refining and separation of subsequent products, and is also not conducive to safe production

Method used

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  • Oxidation method for olefin
  • Oxidation method for olefin
  • Oxidation method for olefin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] The catalyst (that is, shaped titanium-silicon molecular sieve TS-1, a spherical catalyst with a volume average particle diameter of 500 μm, the content of titanium-silicon molecular sieve TS-1 in the catalyst is 80% by weight, the content of silicon oxide is 20% by weight, and the density is 0.76 g / cm 3 ) is packed in a fixed-bed reactor to form a catalyst bed, wherein the number of the catalyst bed is 1 layer.

[0081] A liquid mixture of propylene, hydrogen peroxide (provided in the form of 30% by weight hydrogen peroxide) as oxidant, methanol and aqueous ammonia (25% by weight) as solvent was fed from the bottom of the fixed bed reactor and passed through Catalyst bed. Among them, the molar ratio of propylene to hydrogen peroxide is 3:1, the molar ratio of propylene to solvent methanol is 1:20, the amount of ammonia water makes the pH value of the liquid mixture 8, and the weight hourly space velocity of propylene is 4h -1 . The initial feed temperature of the li...

Embodiment 2

[0088] Adopt the same method as in Example 1 to oxidize propylene, the difference is that during the reaction process, when condition 1 is met for the first time, the temperature of the liquid mixture is increased by 0.02-2°C / day until condition 2 is met, and the increase is stopped. the temperature of the liquid mixture and keep it at the raised temperature; when condition 1 is met for the second time, increase the quality of hydrogen peroxide in the liquid mixture in the range of 0.02-2% / day (by increasing the hydrogen peroxide in hydrogen peroxide). The concentration of hydrogen peroxide is realized, and the consumption of hydrogen peroxide is reduced correspondingly, to keep the mol ratio of hydrogen peroxide and propylene constant) until condition 2 is met, stop improving the quality of hydrogen peroxide in the liquid mixture and keep it as the numerical value after raising, according to this By analogy (that is, when condition 1 is met for the odd number of times, the tem...

Embodiment 3

[0091] Adopt the same method as Example 2 to oxidize propylene, the difference is that the titanium-silicon molecular sieve TS-1 in the catalyzer is replaced with an equivalent amount of hollow titanium-silicon molecular sieve (that is, the hollow titanium-silicon molecular sieve is molded, and the density of the catalyst is 0.70g / cm 3 ).

[0092] The reaction was carried out for 860 hours. At the end of the reaction, the feed temperature of the liquid mixture was 41° C., and the concentration of hydrogen peroxide in the hydrogen peroxide was 39% by weight. The results of 0.5 hours and 860 hours of reaction are listed in Table 1.

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Abstract

The invention discloses an oxidation method for olefin. The method comprises the step of subjecting a liquid mixture and a titanium-silicate molecular sieve to contacting under the condition of oxidation reaction, wherein the liquid mixture comprises olefin, at least one oxidant, and at least one optional solvent; and when selectivity of a target oxidation product is lower than an expected value, the method also comprises the steps of improving a feeding temperature of the liquid mixture and optionally improving the quality of the oxidant in the liquid mixture. The method provided by the invention can maintain the selectivity of the target oxidation product at a high level for a long time, effectively prolong the single-way service life of the titanium-silicon molecular sieve used as a catalyst, and reduce regeneration frequency of the catalyst.

Description

technical field [0001] The present invention relates to an olefin oxidation method. Background technique [0002] Epoxides are an important class of oxygen-containing organic compounds. For example, propylene oxide is an important basic organic chemical raw material, and its yield is second only to polypropylene among propylene derivatives. The largest use of propylene oxide is to produce polyether polyols for further processing to make polyurethane, and it can also be used to produce propylene glycol which is widely used. In addition, propylene oxide can also be used in the production of surfactants, oilfield demulsifiers, etc. [0003] With the wide application of polyurethane and other materials, the demand for propylene oxide is increasing year by year. However, the current industrial production of propylene oxide still has drawbacks, especially the inability to meet the requirements of green chemistry. Therefore, there is an urgent need to develop economical and env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/12C07D301/19C07D303/04
CPCY02P20/582Y02P20/584
Inventor 林民史春风朱斌
Owner CHINA PETROLEUM & CHEM CORP
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