System for hydrogen purification and wax oil hydrogenation coupling in hydrogen from coal

A wax oil hydrogenation and coal-to-hydrogen technology, applied in the chemical industry, can solve the problems of difficult adsorbent regeneration, high energy consumption in cryogenic separation, and high investment costs, so as to reduce equipment investment and operating costs, reduce equipment investment, The effect of reducing operating costs

CN109054893AActive Publication Date: 2018-12-21DALIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-12-21

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Abstract

The invention belongs to the technical field of chemical engineering and provides a system for hydrogen purification and wax oil hydrogenation coupling in hydrogen from coal. The system comprises a membrane separation based carbon dioxide separation unit in hydrogen from coal, a hydrogen purification unit, a wax oil hydrogenation refining unit and an oil-gas separation unit. By adopting the system, firstly, carbon dioxide in reforming gas of the hydrogen from coal is separated out by using a two-stage carbon membrane separator, then, residual permeate gas of a first-stage carbon membrane is mixed with circulating hydrogen from a hydrogenation unit, a mixture enters a hydrogen membrane separator, a small quantity of the carbon dioxide and sulfuretted hydrogen in the hydrogen as a product are removed, the product enters the wax oil hydrogenation refining unit for hydrogenation, finally, oil-gas separation is performed, and the circulating hydrogen enters the hydrogen membrane separator.The system provided by the invention can realizes high coupling of hydrogen purification and utilization, lowers the investment and running costs of the hydrogen purification unit as well as the hydrogenation partial pressure at the same time and improves the wax oil hydrogenation efficiency.
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Description

technical field

[0001] The invention belongs to the technical field of chemical industry and relates to a system for coupling hydrogen purification and wax oil hydrogenation in hydrogen production from coal. Background technique

[0002] Fluid catalytic cracking (FCC) process is one of the most effective technologies for converting heavy oil into high-value products such as gasoline, diesel and liquefied gas. It is widely used in petroleum and is the most important means of secondary processing of petroleum.

[0003] Wax oil hydroprocessing technology began to be applied in the 1970s. The original purpose was to produce low-sulfur fuel oil and reduce sulfur emissions from regenerators in FCC units to meet environmental protection regulations. In recent years, it has been recognized that the nitrogen and aromatics in the FCC feed are the key factors affecting the efficiency of the FCC unit. Reducing the content of nitrogen and aromatics in the raw material can increase the g...

Examples

Embodiment Construction

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] see figure 1 , the system of the present invention comprises a carbon dioxide separation unit, a hydrogen purification unit, a wax oil hydrorefining unit and an oil-gas separation unit;

[0036]The carbon dioxide separation unit is located at the beginning of the system. Firstly, the coal-to-hydrogen conversion gas is cooled from 300°C to 25°C and the pressure is 3MPa. After the water is discharged from the liquid separation tank, it enters the precision filter to filter out dust, water vapor, etc. to ensure The gas entering the membrane separator is pure, at this time the molar concentration of hydrogen is 55.12%, and the molar concentration of carbon dioxide is 40.02%. After being separated by the 1# carbon membrane...