A process for catalytic gasification of carbonaceous feedstock

A raw material and carbonaceous technology, applied in the field of synthesis gas preparation, can solve the problem of not providing catalyst, etc., and achieve the effect of enhancing the purity and reducing the circulation rate

Inactive Publication Date: 2015-10-28
RELIANCE INDUSTRIES LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalyst recovery and regeneration is always a major concern and often requires additional methods that result in additional expense
[0025] The literature also describes supported catalysts as individual solid particles in fluidized bed gasifiers, however, does not provide suitable catalysts or suitable supports for obtaining sufficient gasification at lower temperatures

Method used

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  • A process for catalytic gasification of carbonaceous feedstock
  • A process for catalytic gasification of carbonaceous feedstock
  • A process for catalytic gasification of carbonaceous feedstock

Examples

Experimental program
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example 1

[0082] Three different feedstock-catalyst mixing methods were considered in these experiments, namely direct mixing, impregnation, and incipient wetness impregnation. The direct mixing method was used in Experiment 1 and Experiment 2, where dried coke (particle size less than 73 microns) was directly mixed with the catalyst and dried at 105°C temperature and atmospheric pressure for 12 hours. The impregnation method was used in Experiments 3 and 4, in which a specified amount of catalyst was dissolved in 200 ml of water, and 10 grams (gms) of dried petroleum coke was dispersed into this water solvent of the catalyst, and heated at a temperature of 80 °C and Drying was carried out for 24 hours at a comparative pressure and for 12 hours at a temperature of 105° C. and atmospheric pressure. In experiments 5 to 8, the supported catalysts were prepared using the incipient wetness method. In this case, the desired amount of catalyst is dissolved in water corresponding to the pore v...

example 2

[0086] A series of experiments were performed at laboratory scale to determine the catalytic activity of the catalysts as suggested in this disclosure. Petroleum coke gasification experiments were carried out in a fixed-bed reactor to investigate the catalytic activity of the proposed catalysts. The experimental setup consisted of a steam generator and a vertical tubular reactor (25.4 mm (1 in) inner diameter, 254 mm (10 in) long) heated by an electric furnace. Once the reactor is loaded with a given weight of feedstock mixture, the feedstock mixture can be heated to the desired temperature under a flow of inert gas (nitrogen). Once the gasification temperature is reached, steam can be introduced into the reactor at a given flow rate. The product gas was collected and analyzed by gas chromatography (GC). Once the desired run time is reached, the flow of steam into the reactor can be shut off. The unconverted carbon is combusted with air and the total combustion product gas ...

example 3

[0091] A series of experiments were performed to investigate the effect of catalyst to petroleum coke ratio on conversion / gasification. Catalysts prepared as described in Examples 1 and 5 were used in these experiments. Carry out the experiment on the same experimental apparatus described in example 2, adopt the ratio of different catalyst coke, as 1:2,1:4,1:8,1:10,1:12,1:20,1: 25, 1:30, 1:40 and 1:50. Table 3 shows that the conversion increases with the ratio of catalyst to coke. It can be seen that the gasification rate increases with the ratio of catalyst to coke, which leads to a decrease in the residence time required for complete conversion. In particular, in fluidized bed gasifiers, residence time plays a major role in the conversion of feedstock. In a two-bed system, maximum conversion can be expected at minimum residence time and highest catalyst loading. This experiment conclusively demonstrates that alkali metal catalysts must not only function as individual par...

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Abstract

An improved process for the catalytic gasification of a carbonaceous feedstock in a dual fluidized bed reactor for producing synthesis gas is disclosed. The disclosure uses γ-alumina as a catalyst support iand heat carrier in the gasification zone (102). The gasification zone (102) is operated at 700 - 750 °C to prevent substantial conversion of γ-alumina to α-alumina, which would manifest in the enablement of high catalyst loading and high recyclability. The catalyst is an alkali metal, preferably K2CO3, so that conversion proportional to total K2CO3 to solid carbon ratio is achieved with as high K2CO3 loading as 50 wt% on the solid support. The combustion zone (140) is operated at 800° - 840° C, to prevent any conversion of the γ-alumina to a-alumina, so that catalyst recyclability of up to 98% is achieved between two successive cycles.

Description

technical field [0001] The present disclosure relates to a method for catalytic gasification of carbonaceous feedstock in a circulating fluidized bed to produce synthesis gas. Background technique [0002] Since 1970, global energy use has increased by as much as 70%, and greenhouse gas emissions have increased by almost 75%. Therefore, it is necessary to reduce carbon dioxide (CO 2 ), sulfur oxides (SO X ), nitrogen oxides (NO X ), particulate matter, and hydrocarbon emissions, often produced by coal and petroleum coke-based methods, can lead to air, water, and soil pollution, causing dramatic climate change. [0003] Gasification is a process that involves reacting carbonaceous materials with controlled amounts of steam and oxygen / air at high temperatures to produce a gaseous mixture known as syngas or synthesis gas, consisting mainly of carbon monoxide, hydrogen and carbon dioxide. These synthetic gases can be used to generate heat as well as mechanical and electrica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08C10K3/02
CPCC10J3/463B01J23/04B01J27/232B01J29/084B01J29/40B01J37/0201C10J2300/0986C10J2300/1637C10J2300/1807C10J2300/1853Y02P20/584Y02P20/52C10B3/00C10J3/00C10K3/02C10L3/08B01J27/25C10J3/466C10J2300/0943C10J2300/0976C10J2300/1246
Inventor 赛迪斯·戴古帕提苏库玛·曼达尔艾斯特·库玛·达斯艾基特·维什瓦纳特·萨普里
Owner RELIANCE INDUSTRIES LIMITED
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