SU1301774A1 - Method for producing sulfur-containing gas mixture - Google Patents

Abstract

The invention relates to the production of micro-concentrations of components in calibration gas mixtures and can be used for calibrating hydrogen sulfide gas analyzers. The aim of the present invention is to improve the accuracy and stability of the preparation of micro-concentrations of hydrogen sulfide in a gas mixture and to simplify the process. The method consists in using the reaction of 38–40% sulfuric acid with a dilute sodium sulfide solution with a concentration of 1.0 to obtain a given microconcentration of hydrogen sulfide in the gas mixture. 5.0 -10 mol / dm., A stabilized additive to the solution of ascorbic acid prepared on detsinormal alkali, and blowing out hydrogen sulfide formed by the reaction of hydrogen sulfide - is a stabilized stream of nitrogen. 1 hp f-ly, 1 silt, 2 tab. CL 4 ;:

Description

The invention relates to methods for producing low concentrations of hydrogen sulfide in gas mixtures.

The purpose of the invention is to improve the accuracy of preparation and stability of small concentrations of hydrogen sulfide in the gas mixture and simplify the method

The method consists in that in order to obtain a predetermined low concentration of hydrogen sulfide in the gas mixture, 38-40% sulfuric acid is reacted with a dilute solution of sodium sulfide with a concentration of 1, Ci, x10 - SjO-IO mol / dm, stabilized in solution 1 g / dm of ascorbic acid prepared on detsinormalkali, and the hydrogen sulfide produced by the reaction of hydrogen sulfide is blown off by a stabilized flow of carrier gas.

The drawing shows the installation for the implementation of the proposed method

The installation contains a source of inert carrier gas 1, a thermostatically controlled reactor 2 separating chamber, a drain tank 3, a two-channel peristaltic pump 4, a gas flow regulator 5, a tank 6 and 7 with sulfuric acid and a dilute sulphide capacity 8 with concentrated acid acid and absorption capacity 9 with a saturated alkali solution.

The method is carried out as follows.

Stabilized flows of 40% sulfuric acid and a decinor gap with a sulphide concentration in it of 250 chS mol / dm and ascorbic acid 1.0 g / dm from tank 6 and 7 using a two-channel peristaltic pump 4 feed 8 coil reactor 2 where chemical reaction according to the following equation:

Na S + Ng SO g Hj S f + Na 50

1. A method for producing a hydrogen sulfide-containing gas mixture by reacting sulfuric acid with sodium sulfide followed by stripping the resulting hydrogen sulfide with an inert carrier gas, different

so that in order to increase accuracy

The stripping of the hydrogen sulfide produced is produced by an inert carrier gas coming from source 1 through the preparation and stability rec-jq microgulator 5 of the flow-gas to the hydrogen sulfide reaction-concentration input, to the output-torus 2., the gas mixture and simplification of the process Stack reactions, sulfuric acid is used with a batch in a container 3, and part of the gas mixture is concentrated to 38–40 wt.%, and sulphide through the upper separator fitting is post-sodium. in the drying capacity of 8 and da-xQ-s mol / dm-. More on the output of the generator. The method according to claim 1, differs the remaining part of the gas through the discharge and with it. that, in order to ensure the capacity 3 and the choke is supplied to the stability of the concentration of sul5

0

five

absorption capacity 9 and reset. Since the reaction products are continuously removed along with the unreacted portion of sodium sulfide and. sulfuric acid from the reactor 2, the stability of the hydrogen sulfide concentration in the output gas mixture depends only on the stability of maintaining the costs of reactants and the inert carrier gas, since the reactor is thermostatically controlled and the rate of chemical reaction is constant over time. By varying the flow rate of the inert carrier gas and the concentration of sodium sulfide and sulfuric acid, it is possible to vary the concentration of hydrogen sulfide in the gas mixture within wide limits.

The dependences of the maximum relative error and stability of hydrogen sulfide-containing gas mixtures on the concentration of sulfuric acid and diluted sodium sulfide are given in table. 1 and 2, respectively (consumption of inert carrier gas 1.4).

As can be seen from the table. 1 and 2, the most optimal ranges of initial concentrations of reagents for — providing the best stability (up to 1% / day) and minimum error (not more than

2.5) for producing hydrogen sulfide-containing gas mixtures according to the proposed method, the following: 1 -10 -5-10 mol / dm Na ,, S and 38-40 wt.% H S04. Moreover, the sodium sulphide solution should be prepared in a decine normal alkali with the addition of 1 g / dm of ascorbic acid, since otherwise the error in the preparation of the gas mixture will be 10%, and the stability - 5% / h.

Claims (1)

1. A method for producing a hydrogen sulfide-containing gas mixture by reacting sulfuric acid with sodium sulfide followed by stripping the resulting hydrogen sulfide with an inert carrier gas, different preparation and stability of micro-concentrations of hydrogen sulphide in the outgoing gas mixture and simplification by process, in order to increase the preparation and stability of micro-concentrations of hydrogen sulfide, in the outgoing gas mixture and simplification of the process sodium feed, the last solution prepared by the preparation of ascorbic acid in the amount of t per decinormal alkali with a rate of 1 g / dm of solution. Table 1 note Sodium Sulfide Concentration  mol / dm The solution was prepared on decine normal alkali with the addition of 1 t / dm of ascorbic acid. T a b l and c a 2 Note. Sulfuric acid concentration 40% by weight N9 Hiso i ffutS Ij- Editor H. Bobkova Compiled by-0. Sagatel n Tehred L. Serdyukova Corrector. Shekmar Order 1186/23 Circulation 456 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4