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Catalyst for preparing pyroparaffine from synthesis gas and preparation method thereof

A technology of catalyst and heavy wax, which is applied in the field of catalyst and preparation of heavy wax from syngas, can solve the problems of catalyst carbon deposition, catalyst deactivation, short life, etc., achieve good stability, high specific surface area, good repeatability

Inactive Publication Date: 2010-03-17
QINGDAO KINGKING APPL CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Theoretically, in order to obtain high molecular weight hydrocarbons (C 35 + , wax), the reaction needs to be carried out under the condition of a large carbon chain growth rate (α>0.9), which will easily cause carbon deposition on the catalyst and lead to catalyst deactivation
The iron-based catalyst currently used for the synthesis of wax, although the price of the catalyst is relatively cheap, has the disadvantages of low activity and short life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Ferric nitrate and copper nitrate are prepared according to the molar ratio of 5 and sodium carbonate as raw materials; the iron and copper precipitates are filtered and washed by the precipitation method, dried at 110°C for 8 hours, and baked at 350°C for 3 hours.

[0024] 20 grams of iron and copper precipitates and roasted products are put into a ball mill with 150ml of distilled water and 20ml of a 5% polyvinyl alcohol aqueous solution to form a slurry;

[0025] Take 5 grams of alumina and immerse it in the ball-milled excess coating solution. After 10 minutes, take it out to dry in the shade, dry at 110°C for 2 hours, and fire at 350°C for 3 hours. The above operation can be repeated until the weight gain is 30%,

[0026] be made of:

[0027] Alumina carrier: 77%

[0028] Metallic iron: 18.3%

[0029] Copper metal: 3.7%

[0030] Potassium carbonate: 1%

[0031] After vacuuming the above samples, use 2% K 2 CO 3 After being immersed in an aqueous solution and dried, the finishe...

Embodiment 2

[0033] Ferric nitrate and copper nitrate are prepared according to the molar ratio of 6 and sodium carbonate as raw materials; the iron and copper precipitates are filtered and washed by a precipitation method, dried at 110°C for 5 hours, and baked at 350°C for 2 hours.

[0034] 20 grams of iron and copper deposits and roasted products, 150ml of distilled water and 20ml of 5% polyvinyl alcohol aqueous solution are put into a ball mill to form a slurry;

[0035] Take 5 grams of alumina, immerse it in the ball-milled excess coating solution, take it out for 10 minutes, dry it in the shade, dry at 110°C for 3 hours, and fire at 350°C for 4 hours. The above operation can be repeated until the weight gain is 25%,

[0036] be made of:

[0037] Alumina carrier: 80%

[0038] Metallic iron: 16.54%

[0039] Copper metal: 2.76%

[0040] Potassium carbonate: 0.7%

[0041] After vacuuming the above samples, use 1.5% K 2 CO 3 After being immersed in an aqueous solution and dried, the finished catalyst ...

Embodiment 3

[0043] Ferric nitrate and copper nitrate according to the molar ratio of 6.5 and sodium carbonate as raw materials; the iron and copper precipitates are filtered and washed by the precipitation method, dried at 110°C for 10 hours, and baked at 350°C for 4 hours.

[0044] 20 grams of iron and copper deposits and roasted products, 150ml of distilled water and 20ml of 5% polyvinyl alcohol aqueous solution are put into a ball mill to form a slurry;

[0045] Take 5 grams of alumina, immerse it in the ball-milled excess coating solution, take it out after 10 minutes and dry it in the shade, dry it at 110°C for 4 hours, and fire at 350°C for 4 hours. The above operation can be repeated until the weight gain is 50%,

[0046] be made of:

[0047] Alumina carrier: 67%

[0048] Metallic iron: 26%

[0049] Metallic copper: 4%

[0050] Potassium carbonate: 3%

[0051] After vacuuming the above samples, use 3% K 2 CO 3 After being immersed in an aqueous solution and dried, the finished catalyst is obta...

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PUM

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Abstract

The invention relates to a kind of catalyst for producing heavy wax with synthesis gas and its manufacturing method. The composed weight percent is: the supporter is 40%~80%; the metal, Fe, is 10%~50%; the metal, Cu, is 10%~20%; potassium carbonate is 0.1%~0.5%. The supporters used are silicon dioxide, aluminium oxide, or the compound of silicon dioxide- aluminium oxide. Using the coating and impregnation method respectively, make the precipitate or the oxidate of Fe and Cu through the ball mill and the potassium carbonate load in the supporter. The conditions for application are: put the catalyst into the fixed-bed reactor; the virgin gas, H2 / CO (molar ratio), is 0.5~2.5; the reacting temperature is 200~260 centigrade; the reacting pressure is 15~45atm; the airspeed is 100~1000h<-1>. Theconversion rate is 30~60%, and the selectivity of the heavy wax (C35<+>) can achieve to more than 40%, so the catalyst has the excellent stability.

Description

Technical field [0001] The invention belongs to a catalyst and a preparation method thereof, and specifically relates to a catalyst for preparing heavy wax from synthesis gas and a preparation method thereof. Background technique [0002] From synthesis gas (CO+H 2 ) Research on the synthesis of low-carbon alcohols, low-carbon olefins, and high-carbon hydrocarbons through F-T reaction has been conducted for many years. Among them, the synthesis of linear high-carbon hydrocarbons (wax) from synthesis gas has been industrialized. Mainly South Africa SASOL company uses synthesis gas to produce two kinds of hydrocarbon waxes, one is soft wax with low melting point, and the other is hard wax with microcrystalline high melting point, called SASOL WAX. There are also WESTO WAX FT series waxes produced in Germany. Recently, the Dutch Shell company established a fuel oil plant with an annual output of 40,000 tons in Malaysia. Among them, the first step is to synthesize high-carbon hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78B01J27/232C07C1/04
Inventor 陈索斌
Owner QINGDAO KINGKING APPL CHEM CO LTD