Method and device for preparing reagent hydrochloric acid

A technology of reagent hydrochloric acid and reagent grade, applied in the field of preparation of reagent hydrochloric acid, can solve the problems of no continuous large-scale production, liquid pollution to the environment, difficult processing, etc., and achieve continuous and stable large-scale production, simple production process, and save removal. Effects of miscellaneous devices

Active Publication Date: 2019-07-02
华融化学(成都)有限公司
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Problems solved by technology

Its main disadvantages are: the liquid after removal of impurities pollutes the environment and is difficult to handle; the absorption process is long and the product quality is unstable; the utilization rate of hydrogen chloride is low and the amount of dilute acid is large
Its main disadvantages are: complex process, many control points; more devices, large floor area, high investment; low production efficiency, low utilization rate of hydrogen chloride gas, and a part of hydrogen chloride gas cannot be separated. The utilization rate is low; the operation labor intensity is high; the maintenance work is difficult and dangerous; it needs to consume a lot of heat to evaporate hydrochloric acid to produce relatively pure hydrogen chloride gas, which consumes a lot of energy; the evaporated hydrogen chloride gas is easy to cause environmental pollution and absorb It will also produce acidic wastewater, which will cause certain harm to the environment; it does not have the ability of continuous large-scale production

Method used

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  • Method and device for preparing reagent hydrochloric acid
  • Method and device for preparing reagent hydrochloric acid

Examples

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Effect test

Embodiment 1

[0026] A kind of preparation method of reagent hydrochloric acid

[0027] Chlorine gas with a purity of 98.6% (volume ratio), an oxygen content of 0.3%, and a flow rate of 200Nm³ / h passes through the chlorine buffer tank (1) and enters the graphite synthesis furnace with a purity of 99.8% (volume ratio) and a flow rate of 215Nm³ / h The hydrogen gas enters the graphite synthesis furnace (3) after passing through the hydrogen buffer tank (2). The chlorine gas and hydrogen gas entering the synthesis furnace burn and react in the furnace to generate hydrogen chloride gas, which is cooled to below 40°C by the hydrogen chloride cooler (4) and enters the hydrogen chloride distribution table (5). The outlet pressure of the graphite synthesis furnace is controlled at 33kPa. Hydrogen chloride (flow rate is 423Nm³ / h, purity is 94.9%, free chlorine content is less than 0.2ppm) from distribution platform (5) enters into I-level falling film absorption tower (6), and is absorbed in the tower...

Embodiment 2

[0030] A kind of preparation method of reagent hydrochloric acid

[0031] Chlorine gas with a purity of 98.5% (volume ratio), an oxygen content of 0.3%, and a flow rate of 200Nm³ / h passes through the chlorine buffer tank (1) and enters the graphite synthesis furnace with a purity of 99.8% (volume ratio) and a flow rate of 215Nm³ / h The hydrogen gas enters the graphite synthesis furnace (3) after passing through the hydrogen buffer tank (2). The chlorine gas and hydrogen gas entering the synthesis furnace burn and react in the furnace to generate hydrogen chloride gas, which is cooled to below 40°C by the hydrogen chloride cooler (4) and enters the hydrogen chloride distribution table (5). The outlet pressure of the graphite synthesis furnace is controlled at 15kPa. Hydrogen chloride (flow rate is 420Nm³ / h, purity is 94.5%, free chlorine content is less than 0.2ppm) from the distribution table (5) enters the I-level falling film absorption tower (6), and is absorbed in the tower...

Embodiment 3

[0034] A kind of preparation method of reagent hydrochloric acid

[0035] Chlorine gas with a purity of 98.8% (volume ratio), an oxygen content of 0.3%, and a flow rate of 200Nm³ / h passes through the chlorine buffer tank (1) and enters the graphite synthesis furnace with a purity of 99.9% (volume ratio) and a flow rate of 215Nm³ / h The hydrogen gas enters the graphite synthesis furnace (3) after passing through the hydrogen buffer tank (2). The chlorine gas and hydrogen gas entering the synthesis furnace burn and react in the furnace to generate hydrogen chloride gas, which is cooled to below 40°C by the hydrogen chloride cooler (4) and enters the hydrogen chloride distribution table (5). The outlet pressure of the graphite synthesis furnace is controlled at 50kPa. Hydrogen chloride (flow rate: 425N m³ / h, purity: 95.3%, free chlorine content less than 0.2ppm) from the distribution table (5) enters the first-level falling film absorption tower (6), and is absorbed by the second-...

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Abstract

The invention discloses a method and a device for preparing a reagent hydrochloric acid. The method comprises the following steps: chlorine and hydrogen are sent into a graphite synthesis furnace, synthesized hydrogen chloride gas is sent into a hydrogen chloride cooler and is cooled, the cooled hydrogen chloride gas enters an I-stage falling film absorption tower, and is absorbed by dilute hydrochloric acid, from an II-stage falling film absorption tower, in the I-stage falling film absorption tower to form reagent grade hydrochloric acid, the hydrogen chloride gas discharged from the I-stagefalling film absorption tower enters the II-stage falling film absorption tower, and is absorbed by ultrapure water in the II-stage falling film absorption tower to form dilute hydrochloric acid, andthe hydrogen chloride gas discharged from the II-stage falling film absorption tower enters a tail gas absorption tower, and is absorbed by the pure water in the tail gas absorption tower to form dilute hydrochloric acid for cycle use. The method has the advantages of simple production process, low investment, small occupied area, high production efficiency, high utilization rate of raw materials, high product quality, low energy consumption, low production cost, no discharge of wastewater or waste gas, convenience in maintenance and control, simplicity in operation, and realization of continuous and stable large-scale production.

Description

technical field [0001] The invention belongs to the field of chemical production, and in particular relates to a method for preparing reagent hydrochloric acid and a device thereof. Background technique [0002] In the prior art, there are two methods for producing reagent grade hydrochloric acid, including a one-step method and a two-step method. One-step technical solution: synthesize hydrogen chloride gas from chlorine and hydrogen in a synthesis furnace, and perform impurity removal reaction after cooling (using one or more reducing substances to react with impurities in hydrogen chloride gas), and the hydrogen chloride gas after removal of impurities The reagent hydrochloric acid is obtained through the absorption of the three-stage absorption device, and the unabsorbed tail gas is absorbed into dilute hydrochloric acid by the hydraulic jet pump. Its main disadvantages are: the liquid after removal of impurities pollutes the environment and is difficult to handle; the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/01
CPCC01B7/012
Inventor 罗小容
Owner 华融化学(成都)有限公司
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