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Preparation and application of dealkadiene hydrogenation protective agents

A technology for hydrogenation protection agent and dediolefin removal, which can be used in catalyst activation/preparation, selective hydrorefining, metal/metal oxide/metal hydroxide catalyst, etc. The problems such as the decrease of layer porosity and the harmful side reactions of diolefins can achieve the effect of low cost, simple preparation process, and preventing the pressure drop of the bed from increasing too fast.

Active Publication Date: 2010-04-14
一重集团大连工程建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coking gasoline contains diolefins, and diolefins undergo polymerization under the catalysis of acids. The main catalyst for hydrogenation of coking gasoline, the carrier of desiliconization agent and some iron removal agents are all alumina, which have certain acid centers. When gasoline comes into contact with these catalysts, it will also undergo a saturation reaction of diolefins, but due to the presence of acid centers, hydrogenation and saturation of diolefins will also undergo harmful side reactions of diolefin polymerization
After the diene is polymerized, the polymer is adsorbed on the carrier, and coke is formed due to high temperature, which reduces the porosity of the bed and causes the pressure drop of the bed to increase too quickly

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0018] The preparation of dediene hydrogenation protection agent comprises the following sequence and steps:

[0019] a. Select porous alumina balls with a diameter of 9mm-15mm and 3-7 holes and Raschig rings with an inner diameter of 1mm-3mm and a length of 5mm-7mm as carriers, and bake them in a high-temperature furnace at 800°C-1000°C respectively 1-3 hours, cool to room temperature for later use;

[0020] b. Prepare the immersion solution, and dissolve 1 part of nickel nitrate and 2 parts of ammonium metatungstate in 40 parts of deionized water according to the mass fraction to make a tungsten-nickel co-immersion solution;

[0021] c. Impregnation. Put the roasted porous balls or Raschig rings into the prepared impregnating liquid. The impregnating liquid should not pass through the porous balls or Raschig rings for more than 100 mm. Soak for 3-5 hours to prepare the protective agent and release the residual The liquid is reserved for use as an impregnating liquid;

[00...

Embodiment 1

[0027] The preparation of dediene hydrogenation protection agent comprises the following sequence and steps:

[0028] a. Select a porous alumina ball with a diameter of 9 mm and a number of holes of 3 and a Raschig ring with an inner diameter of 1 mm and a length of 5 mm as the carrier, and roast them in a high-temperature furnace at 800 ° C for 1 hour, and cool to room temperature for later use;

[0029] b. Prepare the immersion solution, dissolve 1Kg nickel nitrate and 2Kg ammonium metatungstate in 40Kg deionized water to make tungsten-nickel co-immersion solution;

[0030] c. Impregnation. Put the roasted porous balls or Raschig rings into the prepared impregnating liquid. The impregnating liquid should not pass through the porous balls or Raschig rings for more than 100 mm. Soak for 5 hours to prepare the protective agent and release the residual liquid It will be used next time with impregnating solution;

[0031] d. Drying, drying the impregnated protective agent at 120...

Embodiment 2

[0036] The preparation of dediene hydrogenation protection agent comprises the following sequence and steps:

[0037] a. Select a porous alumina ball with a diameter of 15mm and 7 holes and a Raschig ring with an inner diameter of 3mm and a length of 6mm as the carrier, and bake them in a high-temperature furnace at 900°C for 2 hours, and cool to room temperature for later use;

[0038] b. Prepare the immersion solution, dissolve 0.5Kg nickel nitrate and 1Kg ammonium metatungstate in 20Kg deionized water to make tungsten-nickel co-immersion solution;

[0039] c. Impregnation. Put the roasted porous balls or Raschig rings into the prepared impregnating liquid. The impregnating liquid should not pass through the porous balls or Raschig rings by more than 100 mm. Soak for 4 hours to prepare the protective agent and release the residual liquid to leave It will be used next time with impregnating solution;

[0040] d. Drying, drying the impregnated protective agent at 110°C for 2 ...

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Abstract

The invention relates to preparation and application of dealkadiene hydrogenation protective agents. The preparation includes: choosing an appropriate alumina multi-hole ball and a rasching ring as carriers to be roasted in a high-temperature furnace and cooled to room temperature; dissolving nickel nitrate and ammonium metatungstate into deionized water to obtain tungsten nickel co-immersion liquor; immerging the roasted multi-hole ball and the roasted rasching ring to obtain protective agents; and drying the immerged protective agents and roasting the dried protective agents to obtain the dealkadiene hydrogenation protective agents. The application of the dealkadiene hydrogenation protective agents includes: the dealkadiene hydrogenation protective agents are placed on the topmost layer of a hydrogenation reactor bed; filling sequence from bottom to top of a reactor is set as main catalysts-disilication catalysts-deferrization catalysts- rasching ring dealkadiene hydrogenation protective agents-alumina multi-hole ball dealkadiene hydrogenation protective agents; and particle size and porosity of the dealkadiene hydrogenation protective agents ought to conform to grading loading requirements. The process for preparing the protective agents has simple technology, low cost, easy operation in loading and fine effect of preventing the pressure drop of the bed from increasing excessively quickly.

Description

Technical field: [0001] The invention relates to a protective agent in petrochemical technology, especially a hydrogenation protective agent. Background technique: [0002] Coking gasoline is a kind of low-quality gasoline, which can be used as raw material for ethylene, reforming and ammonia synthesis after hydrotreating. Coker gasoline hydrogenation technology also has a development process. In the early stage of application of coker gasoline hydrogenation technology, due to lack of understanding of coker gasoline hydrogenation law, the most common problem of coker gasoline hydrogenation unit is that the bed and system depressurization increase too fast, continuous Short start times require downtime to deal with increased pressure drop. CN101029254A discloses the "hydrogenation method of thermally processed gasoline". After heat exchange, the thermally processed gasoline and hot mixed hydrogen are mixed in front of the furnace, and then heated to the reaction temperature ...

Claims

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Application Information

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IPC IPC(8): B01J23/888B01J37/02C10G45/38
Inventor 陆久民阎富山李红琳
Owner 一重集团大连工程建设有限公司