Method for selectively hydrogenating carbon-4 and carbon-5

A C4C5 selectivity and selectivity technology, applied in chemical instruments and methods, hydrogenation hydrocarbons, carbon compound catalysts, etc., can solve the problems of low olefin content and unsuitable use of terpene resin blockers, etc., to achieve The effect of sufficient reaction, increased contact area, and improved conversion rate

Inactive Publication Date: 2019-03-08
濮阳市联众兴业化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, C4C5 raw materials with high monoene content are scarce in my country's market, and there are a large number of vacancies in the market. Traditional C4C5 hydrogenation hydrogenation, hydrogenation of dienes into alkanes, part of monoolefins are converted into alkanes, and the content of olefins is low. Suitable for use as a terpene resin blocker

Method used

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  • Method for selectively hydrogenating carbon-4 and carbon-5
  • Method for selectively hydrogenating carbon-4 and carbon-5
  • Method for selectively hydrogenating carbon-4 and carbon-5

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] Preparation of nickel catalyst: firstly, heating the nickel containing 53.0-85.0% by weight and 9.0-20% by weight of silicon to melt, then rapidly solidifying the melt at a cooling rate greater than 1000°C / S, and adding the solidified product under stirring to the Extract the alkali solution with a temperature of 100°C to fully react the silicon in the alloy with the alkali, then decant the liquid, wash the sample with distilled water until the pH value is less than 10, and then add it to an acid solution at 100°C to oxidize the surface of the catalyst Passivation, the sample after pickling is washed with distilled water until the pH is 6.5 to obtain the nickel catalyst, the concentration of the alkali solution is 20% by weight, and the weight ratio of the alloy to the alkali is 1:5; the acid The concentration of the liquid is 20% by weight, and the weight ratio of the alloy to the acid is 1:5, wherein the acid is HNO3.

[0021] Preparation of nickel-molybdenum catalyst...

Embodiment 1

[0023] The material to be hydrogenated is fed into the reactor from the bottom up. The reactor is loaded with a selective hydrogenation catalyst nickel catalyst. The material to be hydrogenated includes C4-C6 dienes and alkynes, and the C4 content is 30 %, the content of carbon five is 85%, and hydrogen is added to the reactor at the same time. The difference is 0.02-0.025MPa. When the pressure difference is large, the contact between hydrogen and the material is insufficient, and the hydrogenation of dienes and alkynes is incomplete; A large amount of reaction with alkynes will cause the loss of olefins, the height of the hydrogenation catalyst will change, and the pressure difference will be adjusted accordingly. The contact time between the material to be hydrogenated and the selective hydrogenation catalyst is 15 minutes. After cooling, the reaction product enters the gas-liquid separation tank for separation treatment , Activated carbon is added to the gas-liquid separati...

Embodiment 2

[0036] In order to verify that another catalyst has the same effect in the method provided by the invention, the reaction conditions in this example are the same as in Example 1, except that the nickel catalyst used in Example 1 is replaced by a nickel-molybdenum catalyst.

[0037] The nickel-molybdenum catalyst is mainly composed of transition metal elements nickel and molybdenum, and has the characteristics of low operating temperature and pressure, high hydrogenation activity, large specific surface area, uniform distribution of active components, and good stability.

[0038] Present embodiment uses nickel-molybdenum catalyst to carry out the product after hydrogenation reaction as shown in the table below:

[0039]

[0040]

[0041] It can be seen from the reacted product that the obtained monoene content accounts for 49.9317% by mass of the total reactant, and the conversion rate is as high as 83.13%.

[0042] Example 2

[0043] In order to verify the influence of ...

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Abstract

The invention belongs to the technical field of light petroleum hydrogenation, and particularly relates to a method for selectively hydrogenating carbon-4 and carbon-5 to convert the carbon-4 and thecarbon-5 into monoolefine. The method for selectively hydrogenating the carbon-4 and the carbon-5 includes that to-be-hydrogenated materials are fed into reactors in feeding modes from bottom to top,selective hydrogenation catalysts are loaded in the reactors, the to-be-hydrogenated materials include C4-C6 diene and alkyne, the content of the carbon-4 is 30%-70%, and the content of the carbon-5 is lower than or equal to 85%; the reactors are simultaneously filled with hydrogen, the temperatures of material inlets of the reactors are 45-60 DEG C, the reaction temperatures are 95-120 DEG C, thereaction pressures are 1.8-2.0 MPa, the reflux ratios are 0, and the differential pressures are 0.02-0.025 MPa when the heights of the catalysts are 1.8 m; the contact time of the to-be-hydrogenatedmaterials and the selective hydrogenation catalysts is longer than or equal to 15 min, reaction products are cooled and then are fed into gas-liquid separation tanks, and separation treatment is carried out.

Description

technical field [0001] The invention belongs to the technical field of hydrogenation of light petroleum, and in particular relates to a method for selectively hydrogenating carbon four and carbon five into monoolefins. Background technique [0002] Pyrolysis carbon five is a by-product of naphtha cracking to ethylene, which contains a variety of special active olefins, and is widely used in daily life because of its unique chemical properties. Cracking C5 contains dienes such as isoprene, cyclopentadiene and dicyclopentadiene, and carbon four carbon pentamonenes such as n-pentene and isopentene. [0003] C4C5 monoene can be used as a blocker for terpene resins. Terpene resins are widely used in adhesives, adhesives, double-sided tapes, solvent-based glues, book bindings, color packaging, tapes, olefin tapes, kraft paper cards Adhesives, tape labels, woodworking adhesives, pressure-sensitive adhesives, hot-melt adhesives, sealants, paints and inks, and other polymer modifier...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/05C07C5/09C07C11/08C07C11/10C07C13/12
CPCC07C5/05C07C5/09C07C2523/755C07C2523/883C07C2601/10C07C11/10C07C11/08C07C13/12
Inventor 张怀敏杨正大闫江豪鲁少飞张文魁
Owner 濮阳市联众兴业化工有限公司
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