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Method for selective hydrogenation for diene and alkyne

A technology for selective hydrogenation and diolefins, which is applied in the field of hydrogenation and can solve problems such as the influence of catalyst hydrogenation performance

Active Publication Date: 2014-07-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In order to meet the current people's requirements for the adaptability of raw materials to water or water content fluctuations in the process of selective hydrogenation of alkynes and dienes, and to suppress the formation of carbon deposits, the present invention proposes a method that can effectively solve the problem of raw materials The problem that the water content or water content fluctuations in the catalyst affect the hydrogenation performance of the catalyst, and the method of the present invention can also suppress the generation of carbon deposits on the catalyst

Method used

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  • Method for selective hydrogenation for diene and alkyne
  • Method for selective hydrogenation for diene and alkyne
  • Method for selective hydrogenation for diene and alkyne

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Take a clover-shaped Pd-Ag / Al with a diameter of 1.5mm 2 o 3 Catalyst 20 grams (produced by Beijing Research Institute of Chemical Industry, volume 47ml, the mass percentage content of Pd and Ag is respectively 0.12% and 0.3%, the balance is Al 2 o 3 , weight loss 1.5wt% when the temperature rose to 500° C. on the thermogravimetric analyzer), the catalyst was loaded into a fixed-bed reactor (diameter 15 mm, length 400 mm, with two temperature display control points). After the reactor temperature is stabilized at 100°C, nitrogen containing 2vol% trimethylethoxysilane is passed into the reactor, the flow rate is controlled at 150ml / min, and the temperature is raised to 120°C after maintaining 100°C for 2 hours. Keep for 1 hour to stop entering the nitrogen containing hexamethyldisiloxane, add argon to lower the temperature, and obtain the catalyst Cat-1.

[0059] Comparison of untreated Pd-Ag / Al by Fourier transform infrared spectroscopy (FTIR) 2 o 3 and Cat-1, the ...

Embodiment 2

[0064] Take a hollow strip Pd-Ga-Mg / SiO with a diameter of 3mm 2 Catalyst 20 grams (produced by Beijing Research Institute of Chemical Industry, volume 41ml, the mass percentage content of Pd, Ga and Mg is respectively 0.2%, 0.6wt% and 0.4%, the balance is SiO 2 , weight loss 1.5wt% when the temperature rises to 500°C on the thermogravimetric analyzer), the catalyst is packed into a 500ml three-necked bottle, the three-necked bottle is placed in the oil bath, one of the three-necked bottles is connected to the cooling coil, one is connected to the thermometer, and the other is connected to the three-necked bottle. Connect to the feed port. First, 100ml of p-xylene was poured into the three-necked flask, and after the temperature of the reactor was stabilized at 80°C, 5ml of trimethylchlorosilane was passed into the reactor. After maintaining 80°C for 2 hours, the temperature was raised to 120°C. After the temperature was stabilized, the temperature was maintained for 1 hour a...

Embodiment 3

[0070] The catalysts of Example 1 and Comparative Example 1 were respectively applied to the selective hydrogenation of acetylene, wherein the acetylene in the raw material accounted for about 1.3% (mass fraction), hydrogen: acetylene = 1.05: 1 (molar ratio). The hydrogenation reactor is a 25ml isothermal fixed bed, and the catalyst is 3.0g. The process conditions of the hydrogenation reaction are shown in Table 1. In the hydrogenation reaction, 1ml of water vapor was pulsed into at 200h to investigate the water resistance of the catalyst. After 1000 h of reaction, the amount of carbon deposition was compared by thermogravimetry-mass spectrometry. Wherein, taking the mole percentage content as a benchmark, the calculation method of conversion rate and selectivity of acetylene is:

[0071] C 2 H 2 Conversion = ( C ...

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Abstract

The invention relates to a method for selective hydrogenation for diene and alkyne. In order to meet the requirements of people on two aspects, i.e. the suitability for raw materials which contain water or fluctuating water content in a selective hydrogenation reaction process for the diene and the alkyne, and the inhibition on the generation of carbon deposit currently, the method proposes that: under the temperature of 20-120 DEG C and the pressure of 0.1-5.0 MPa, the diene and the alkyne in alkyne material flow which is rich in alkene are produced into mono alkene under the action of a hydrogenation catalyst through the selective hydrogenation. The hydrogenation catalyst comprises a carrier, a metal active component, i.e. palladium, and silane groups, further, the silane groups are grafted through a silylanizing treatment, and the content of the grafted silane groups in the total mass of the catalyst is 0.05 wt% to 25 wt%. Compared with the prior art, with the adoption of the catalyst in the method provided by the invention, the conversion rate of the diene and the alkyne, and the selectivity of the mono alkene have no obvious change when hydrogenated raw materials contain trace water; and meanwhile, the generation amount of the carbon deposit of the catalyst is little, so that a hydrogenation system has better long-term running stability.

Description

technical field [0001] The present invention relates to a method for hydrogenation, more particularly, the present invention relates to a method for selectively hydrogenating diolefins and alkynes into monoolefins. Background technique [0002] Monoolefins are important raw materials in industry, among which ethylene, propylene, butene and styrene are extremely important chemical intermediates. The current commercial production methods of olefins include steam cracking, catalytic cracking, thermal cracking, alcohol dehydration, methanol cracking reaction and syngas synthesis of olefins, among which steam cracking is the main way of monoolefin production. The ethylene, propylene, butene and other products produced in the above-mentioned industrial processes contain a small amount of alkynes or dienes. Since alkynes and dienes affect the subsequent polymerization effect and product quality, the removal of alkynes and dienes is an important part of mono-olefin production techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/167C07C7/163C07C11/08C10G45/40C10G70/02B01J31/28
Inventor 黄龙田保亮戴伟彭晖唐国旗
Owner CHINA PETROLEUM & CHEM CORP