Technological process of desulfurizing coking benzene to co-produce refined benzene and nitro benzene

A desulfurization process, nitrobenzene technology, which is applied in the field of coking benzene desulfurization, can solve problems such as difficulties, inapplicable treatment, and small adsorption capacity, and achieve the effects of reducing the amount of acid, outstanding economic benefits, and low raw material consumption

Active Publication Date: 2007-11-07
JIANGSU KESHENG CHEM MACHINERY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

For example, the catalytic hydrogenation method can completely remove thiophene in coking benzene, and the quality of the product benzene is comparable to that of petroleum benzene, but the one-time investment is high, the reaction conditions are harsh, and the operating cost is high, and it is only suitable for large-tonnage coking benzene Refining process; extractive distillation method is separated by adding appropriate solvent to increase the relative volatility of benzene and thiophene, but this method is not suitable for dealing with coked benzene containing trace th...

Method used

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  • Technological process of desulfurizing coking benzene to co-produce refined benzene and nitro benzene
  • Technological process of desulfurizing coking benzene to co-produce refined benzene and nitro benzene

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Embodiment 1

[0035] Example 1. The invention discloses a coking benzene desulfurization process method in which refined benzene and nitrobenzene are co-produced. Its process flow and reaction principle formula can refer to Figure 1 and Figure 2 respectively.

[0036] This embodiment includes the following steps:

[0037] (1) Add sulfuric acid, nitric acid and benzene with a concentration of (68-80)% into the nitration pot, the volume ratio of sulfuric acid, nitric acid and benzene is 3:1.1:1, and the reaction temperature is controlled between (55-75)°C , continuous nitration, the concentration of nitric acid is adjusted according to the mass ratio of product benzene and nitrobenzene, after pickling and nitration, nitrobenzene with a mass content of 99.9% is obtained, and the rest is benzene. After purification and separation, the total sulfur content of benzene and nitrobenzene is less than 2ppm;

[0038] (2) After the benzene, nitrobenzene and dilute acid coming out from the nitration ...

Embodiment 2

[0042]Example 2. The invention discloses a coking benzene desulfurization process method in which refined benzene and nitrobenzene are co-produced. Its volume ratio is sulfuric acid: nitric acid: benzene = 5: 0.03: 1, the reaction temperature is controlled at 25 ° C, the mass content of benzene after pickling and nitration is 99%, after refining and separation, the total sulfur content of benzene and nitrobenzene Less than 2ppm. All the other are with embodiment 1.

Embodiment 3

[0043] Example 3. The invention discloses a coking benzene desulfurization process method in which refined benzene and nitrobenzene are co-produced. Its volume ratio is sulfuric acid: nitric acid: benzene=1:0.25:1, and the reaction temperature is controlled at 55-75° C. to obtain petroleum-grade benzene and 25% nitrobenzene with a mass content of 75%. After refining and separating, The total sulfur content of benzene and nitrobenzene is less than 2ppm. All the other are with embodiment 1.

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Abstract

The technological process of desulfurizing coking benzene to co-produce refined benzene and nitro benzene includes the following steps: adding (68-80) % concentration sulfuric acid solution, nitric acid and coking benzene in the volume ratio of (1-5) to (0.01-1.1) to 1 into a nitrifying reactor and continuous nitrification at 5-75 deg.c; separating the resultant in a separator before neutralizing and water washing; rectifying in a rectifying tower with top temperature 50-80 deg.c and top pressure of 0.05-0.1 MPa to produce nitro benzene in the tower bottom; desulfurizing the mixture of benzene and CS2 from the top of the rectifying tower in a desulfurizing tower with top temperature of 35-75 deg.c to produce benzene in the tower bottom while eliminating CS2 from the top; and other steps. The process has less benzene loss and high economic utility.

Description

technical field [0001] The invention belongs to the technical field of coking benzene desulfurization, and more specifically relates to the innovation of coking benzene desulfurization process method of co-production of refined benzene and nitrobenzene. Background technique [0002] Coking benzene is a by-product of iron and steel enterprises and coking enterprises. Due to its high sulfur content (mainly in the form of thiophene, its content is generally around 4000ppm), its comprehensive application is severely limited. For example, it affects the life of equipment and catalysts used in the processing of subsequent products of benzene, and also affects the quality of subsequent products. With the continuous rise of oil prices and the development of coal deep processing industry, more and more coking benzene will be supplied to the market. The research and improvement of coking benzene desulfurization process is of great significance. [0003] The...

Claims

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Application Information

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IPC IPC(8): C07C205/06C07C201/08C07C15/04C07C7/17C01B17/56
Inventor 王武谦
Owner JIANGSU KESHENG CHEM MACHINERY
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