Process of generating hydrogen by cracking biomass with molten alkali

A technology of molten alkali and biomass, which is applied in the field of hydrogen production from molten alkali cracking biomass, which can solve the problems of low hydrogen yield, harsh process conditions, and high temperature and pressure, and achieve low melting temperature, good controllability, and hydrogen production The effect of mild process conditions

Inactive Publication Date: 2010-06-30
ZHEJIANG UNIV OF TECH
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Problems solved by technology

The thermochemical conversion method uses biomass as raw material to produce hydrogen by using thermophysical and chemical principles and technologies, such as biomass cracking hydrogen production, biomass gasification hydrogen production, biomass catalytic cracking / gasification hydrogen production, supercritical conversion hydrogen production etc. These hydrogen production methods either have the disadvantages of low yield of hydrogen, need to add gasifying agent, or high temperature and pressure, and harsh process conditions.

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  • Process of generating hydrogen by cracking biomass with molten alkali
  • Process of generating hydrogen by cracking biomass with molten alkali

Examples

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example 1

[0017] Using sodium hydroxide as the heating medium, the reactor was heated to 450°C, nitrogen protective gas was introduced at a flow rate of 240L / h, and then 34.9g of rice straw was added. The straw begins to crack rapidly in the reactor. The pyrolysis product is 1.8g solid charcoal, 2.2g liquid product (wherein water content is 95%), 42.97L product gas. The product gas contains H2 in the product gas through gas chromatography analysis and is 69.69% (v%, the same below), CH4 is 16.69%, and O2 is 13.62%. The hydrogen yield was 0.80 Nm3 / kg rice straw, or 71.28 g / kg rice straw.

[0018] A kind of technological process of the above-mentioned molten alkali cracking biomass hydrogen production is as attached figure 1 shown. The operation process is as follows: put the alkali in the reaction kettle 3, heat it to the set temperature, pass in the protective gas, turn on the stirring motor 2, and use the biomass as the processed material to continuously enter the reaction kettle fr...

example 2

[0020] Using sodium hydroxide as the heating medium, when the reactor is heated to 400°C, a nitrogen protective gas is introduced at a flow rate of 240L / h, and then 46.3g of rice straw is added. The straw begins to crack rapidly in the reactor. The pyrolysis product is 1.2g solid charcoal, 2.6g liquid product (water content 95%), and 48.2L product gas. The product gas contained H2 was 71.50% (v%, the same below) through gas chromatography analysis, CH4 was 20.31%, and O2 was 8.19%. The hydrogen yield was 0.69Nm3 / kg rice straw.

example 3

[0022] Using potassium hydroxide as the heating medium, the reactor was heated to 400°C, nitrogen protective gas was introduced at a flow rate of 240L / h, and then 44.5g of rice straw was added. The straw begins to crack rapidly in the reactor. The pyrolysis product is 1.0g solid charcoal, 1.0g liquid product (95.6% water content), 40.6L product gas. The product gas contains H2 in the product gas through gas chromatography analysis and is 77.87% (v%, the same below), CH4 is 14.59%, and O2 is 7.54%. The hydrogen yield was 0.66Nm3 / kg rice straw.

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Abstract

The invention relates to a process of generating hydrogen by cracking biomass with a molten alkali. The process comprises the following steps: filling the molten alkali which is used as a heating, catalyzing and reacting medium into a reactor; introducing a protective gas into the reactor; and setting the reaction temperature between 320 and 900 DEG C and then at the preset temperature, adding the biomass into the reactor to depolymerize organic high polymers. The mass ratio of the molten alkali to the biomass is 50: 1-1: 1; and the pyrolysis product comprises a pyrolysis gas (which also can be called a product gas), a solid carbon and a liquid product. The process has the advantages that: the molten alkali is a good reacting catalyst, and is cheap and easily recyclable; the molten alkali is a good heating medium which quickly transfers heat to the biomass by tightly contacting the biomass so as to realize fast cracking of the biomass; the molten alkali used is low in temperature and can be operated at a relatively low temperature; and the hydrogen generation process has mild conditions, a cracking device is simple, the operation is convenient and the controllability is high.

Description

technical field [0001] The invention belongs to the field of hydrogen production technology, and relates to a hydrogen production technology by molten alkali cracking biomass. Background technique [0002] As an important chemical raw material, hydrogen has a wide range of uses in the basic organic chemical industry, petrochemical industry, pharmaceutical chemical industry and fine chemical industry; in addition, hydrogen will play an important role in new energy as hydrogen energy. The oxygen reaction process will generate thermal energy or electric energy (hydrogen-oxygen fuel cell) to serve human beings, and its product is non-polluted water, which is one of the ideal clean energy sources for human beings. Therefore, it is of great significance to seek advanced hydrogen production technology. [0003] The existing hydrogen production methods can be mainly divided into the following three categories according to the types of raw materials: ①Using hydrocarbons such as petr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02C01B3/22C10J3/57
Inventor 计建炳艾宁于凤文沈琦姬登祥姜洪涛
Owner ZHEJIANG UNIV OF TECH
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