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A kind of molecular sieve dewaxing adsorbent and preparation method thereof

A technology of molecular sieve and adsorbent, which is applied in the field of molecular sieve dewaxing adsorbent and its preparation, can solve the problems that the grain size of ultrafine 4A zeolite is not given, and the grain size cannot be completely controlled, so as to achieve the effect of improving the yield

Active Publication Date: 2015-07-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the surfactant plays a role in dispersing the solution ions to a certain extent, it cannot completely control the crystallite size, and the patent does not give data on the crystallite size of the ultrafine 4A zeolite

Method used

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  • A kind of molecular sieve dewaxing adsorbent and preparation method thereof
  • A kind of molecular sieve dewaxing adsorbent and preparation method thereof
  • A kind of molecular sieve dewaxing adsorbent and preparation method thereof

Examples

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preparation example Construction

[0018] The preparation method of adsorbent without modified molecular sieve provided by the present invention includes the following steps:

[0019] (1) Mix the silicon source, aluminum source, alkaline compound and water to prepare a molar ratio of (15-17) Na 2 O: Al 2 O 3 :(14.0~16.0) SiO 2 :(270~374)H 2 O mixture material, 10 ~ 30 ℃ aging for 20 ~ 48 hours to obtain a directing agent; then press to mix the silicon source, aluminum source, alkaline compound, water and directing agent, so that the molar ratio of each substance in the mixture is (3.0 ~ 4.2) Na 2 O: Al 2 O 3 :(1.8~2.0) SiO 2 :(150~200)H 2 O, and make the directing agent account for 1.0-15% by mass of the total mixture, crystallize at 95-100°C for 3.0-6.0 hours to obtain NaA molecular sieve,

[0020] (2) NaA molecular sieve and binder are mixed into rolling balls, calcined at 450-600℃, treated with alkali solution, and then ion exchanged with calcium salt or magnesium salt solution and dried.

[0021] The preparation m...

example 1

[0035] Prepare the adsorbent of the present invention.

[0036] (1) Preparation of directing agent

[0037] Press 16Na 2 O: Al 2 O 3 :15SiO 2 :320H 2 The molar ratio of O to prepare the directing agent. First dissolve 18.79g of NaOH solid particles in 79g of deionized water, stir and mix well, add 21.02g of sodium metaaluminate and 82.86g of water glass in sequence, fully stir for 60 minutes, and age at 30°C for 25 hours to obtain a milky white colloidal solution: Directing agent.

[0038] (2) Preparation of NaA molecular sieve

[0039] Dissolve 1.74g of NaOH solid particles in 85.4g of deionized water, stir and mix well, add 7.42g of water glass, 12.92g of directing agent, and 25.56g of sodium metaaluminate in sequence, and stir for 30 minutes to obtain a thick silica-alumina gel. Material molar ratio is 4.1Na 2 O: Al 2 O 3 :1.8SiO 2 :200H 2 O, the added directing agent accounts for 1.2% by mass of the total material. The above silica-alumina gel was sealed in a polypropylene bott...

example 2

[0044] The adsorbent was prepared according to the method of Example 1, except that the amount of directing agent added in step (2) was 64.60 g, accounting for 5.96 mass% of the total synthetic materials, and in step (3) the matrix pellets formed by rolling balls were subjected to Mg 2+ Exchange, the exchange liquid used is MgCl with a concentration of 0.25mol / L 2 Solution, Mg 2+ The exchange degree was 75 mol%, and adsorbent E was obtained, which contained 94% by mass of MgA molecular sieve and 6% by mass of kaolin.

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Abstract

The invention discloses a molecular sieve dewaxing adsorbent, comprising 90-99% by mass of molecular sieve A and 1-10 % by mass of binder, wherein the grain size of the molecular sieve A is 0.1-1.0 micron; the cation of the molecular sieve A is Ca<2+> or Mg<2+>. The adsorbent has high hydrothermal stability and adsorptive property; n-alkanes of which the carbon number is greater than 14 can be adsorbed and separated from raw materials.

Description

Technical field [0001] The present invention is a molecular sieve dewaxing adsorbent and its preparation method, specifically, it is a kind of 9 ~C 30 An adsorbent for separating and purifying normal paraffins from a hydrocarbon mixture and a preparation method. Background technique [0002] Usually straight-run kerosene is dewaxed by molecular sieve and distillate is cut to obtain aviation kerosene and liquid paraffin. The content of n-alkanes is an important quality indicator of liquid paraffin. It is very important to understand the properties of liquid paraffin and aviation kerosene and guide the production. If you master the content and distribution of n-alkanes in liquid paraffin and raw materials, you can have a purpose Proceed to the production of aviation kerosene. [0003] Linear alkanes can be used as the alkyl component of sulfonated alkaryl and alkyl sulfonate synthetic detergents. Straight-chain alkanes are preferred in the production of detergents, because they can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/16B01J20/30C10G25/03
Inventor 王志光王红超王辉国马剑锋杨彦强
Owner CHINA PETROLEUM & CHEM CORP
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