JPS5966491A - Gas purification - Google Patents

Abstract

PURPOSE:To remove hydrogen sulfide from a reducing gas easily, by adding sulfur dioxide to a reducing gas flow, converting hydrogen sulfide into sulfur in the presence of a reducing catalyst. CONSTITUTION:Sulfur dioxide is added to a reducing gas flow such as CO, H2, etc. and hydrogen sulfide is converted into fulfur preferably at normal pressure -20kg/cm<2>G at 300-2,000 SV(hr<-1>) at 200-400 deg.C in the presence of a reducing catalyst (1-30wt% one ore more oxides of metals selected from a group consisting of Ni, Co, Mo, W, Fe, and Cr on alumina, silica alumina, titania, etc.).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing hydrogen sulfide from reducing gases such as carbon monoxide and hydrogen.

The soaring price of crude oil and the heavier crude oil imported into Japan are greatly jeopardizing Japan's future energy outlook. To deal with this, gasification is performed using the residue obtained by extracting distillate oil from crude oil, so-called distillation residue, or coal as a raw material, and the carbon monoxide (CO) and hydrogen gas obtained from it are used to produce gas as it is. Direct fuel method (
There is a method of synthesizing fuel from 0, 1 (2), and an oil alternative energy policy has been launched to convert to ethylene, fluoropylene, acetic acid, etc., which were conventionally obtained from petroleum products.

During this gasification reaction, the sulfur compounds in heavy oil and coal are sulfides, mainly 14. Various t1\! are converted to S and mixed into co and T-1° reducing gas! ! ! ! A law has been proposed and is in operation.

One of these is the wet method, which is a process in which hydrogen sulfide is chemically absorbed and removed. This method requires cooling to absorb into the aqueous solution, which causes energy loss and absorption liquid regeneration.
There are issues such as wastewater treatment.

Another dry method involves reacting with iron oxide and fixing it as iron sulfide, but the fixed 1-cold yellow cannot be reused as iron oxide unless it is dissipated through a regeneration process.

Therefore, the present inventors conducted extensive research into a method for removing hydrogen sulfide that does not have the drawbacks of conventional methods, and finally completed the present invention.

That is, in the process of removing hydrogen sulfide from a dormitory source gas such as carbon monoxide and hydrogen, the present invention mixes sulfur dioxide into the gas stream and then converts it to sulfur in the presence of a primary catalyst. The present invention relates to a gas purification method characterized by the following.

As the reduction catalyst used in the present invention, N1, Cn
, Mo, W, Fe, Cr, and one or more metal oxides are supported on alumina, silica/alumina, titania, etc. in an amount of 1 to 50%. things are used.

In addition, the conversion reaction H'' of hydrogen sulfide to sulfur, as seen in the following formula (1) % formula % (1), the disappearance of VcS02 (2
This is done by erasing S, but actually the following (
2) Since the reaction of formula % formula %) also occurs at the same time, the amount of S02 disappeared is compared to 1.
The erasing ability of H2S is low. Therefore, the amount of S02 added is preferably in the range of stoichiometrically equivalent to twice the amount of FT2 S in the reducing gas.

Father, the conversion reaction conditions are normal pressure to 2[]→/cn? O pressure range, 5 n O ~ 201'IO no GV (h-'1
) range, and a temperature range of 20(] to 400°C is preferred.

The method of the invention requires no cooling of the gas, no need for regeneration,
tX, S is converted to sulfur by catalytic oxidation. Therefore, since sulfur converted from sulfide is liquid at temperatures above the melting point and solid at temperatures below the melting point, it can be easily removed from the system of the 1'a elemental gas. .

The advantages of the present invention will be explained in detail using a real blood example.

Example 111 catalyst γ-alumina bodies were subjected to a death test with the composition VCTT□S + 000 p, p, m shown in Table 1 added as a gas obtained by partially burning coal.
A commercially available product carrying 3.8% by weight, M (10314.7@il%) was crushed into 10 to 14 meshes.

10ml of this catalyst? The mixture was filled into a W-type reactor and heated to the reaction temperature.

A test gas containing the above H7S+ tl OOp, p, m was passed through this catalyst layer, and the reaction conditions shown in Table 2 were set.
1 ÷ Catalyst loading amount ml Under these reaction conditions, 802 was added to the upstream side of the catalyst layer at a concentration of 500 p, p, m, and the concentration of N2 S, F > 02 components on the downstream side of the catalyst was analyzed. The fruits were washed, and the conversion rate of vCI-1,S to sulfur was calculated and shown in Table 5.

Table 5: As mentioned above, the conversion rate of H and S to sulfur is 140. This means that twice the amount of i-T, S will be lost, but in reality, the reaction of equation (2) occurs simultaneously, so the amount of FT, s lost is not small compared to the amount of SO2 lost. .

Therefore, the conversion rate to sulfur is defined here as follows.

Next, So, 1000 p, p, m, N when added
The results of the conversion test to 2S are also shown in Table 5 above. Furthermore, during both of these tests (no generation of O8 could be detected).

As a result of the above, when an equal amount of 802 in the reducing gas is reacted in the presence of a catalyst, it is possible to convert most of the 2S into sulfur. It is an excellent invention because it is in a solid state and can be easily separated from a gaseous body compared to conventional methods.

In addition, in the test, SO7 was used separately, but in the actual process, it can be used by burning the material.

Sub-agent: 1) Akira Sub-agent Hagi Ryo - -611,-

Claims (1)

[Claims] In a process for completely removing hydrogen sulfide from reducing gases such as carbon monoxide and hydrogen, gas purification is characterized by mixing sulfur dioxide into the gas light and then converting it to sulfur in the presence of a reducing catalyst. Law.