Unlock instant, AI-driven research and patent intelligence for your innovation.
A kind of chlor-alkali production process
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A production process and chlor-alkali technology, applied in the field of chlor-alkali industry, can solve the problems such as increase and decrease in the amount of light salt water treatment, increase in process consumption, etc., so as to reduce the consumption of acid, reduce consumption, and reduce the amount of light salt water that needs to be neutralized Effect
Active Publication Date: 2020-02-28
ZHEJIANG OCEANKING DEVELOPMENT CO LTD
View PDF6 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0004] Its disadvantage is that acid is added to the anolyte to reduce the oxygen content in the product chlorine, the pH of the light brine from the anode chamber is further reduced, the amount of lye required for subsequent treatment increases and the amount of light brine treatment increases, making the process increased consumption
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0032] A kind of chlor-alkali production process, it comprises following production steps,
[0033] S1: add the refined saturated NaCl solution to the light brine from S4, and mix to obtain the anolyte;
[0034] S2: Send the anolyte into the anode chamber of the electrolytic cell at a flow rate of 200kg / h, and send the circulating lye of NaOH into the cathode chamber as the catholyte. The flow rate of the catholyte is 360kg / h. Add 32wt% hydrochloric acid to the anolyte in the anode chamber to adjust and maintain the pH of the anolyte at 2-3;
[0035] S3: After electrification, the anolyte and catholyte in the electrolytic cell are heated up. After the temperature is higher than 85°C, keep the temperature of the anolyte and catholyte at 85-90°C, and adjust the air pressure in the anode chamber and cathode chamber to make the air pressure in the cathode chamber 101.3 kPa, the air pressure in the cathode chamber is greater than the air pressure in the anode chamber and the diffe...
Embodiment 2
[0045] A chlor-alkali production process, which is improved on the basis of Embodiment 1. Before the anolyte enters the anode chamber, it exchanges heat with the wet chlorine gas sent to the chlorine gas treatment device, and heats the anolyte to 67-73°C.
[0046] According to the above-mentioned chlor-alkali production process, the obtained parameters are shown in the table below.
[0047]
[0048] It can be seen from the above that the wet chlorine gas preheats the anolyte, recycles the internal energy in the wet chlorine gas, and heats the anolyte, so that the anolyte can reach the temperature required for electrolysis faster after being added to the anode chamber, so as to keep the temperature in the anode chamber stable and avoid influence The rate of chlorine gas produced by electrolysis; on the other hand, it prevents the mechanical damage of the ion membrane caused by the short-term severe pressure difference between the anode chamber and the cathode chamber, and pro...
Embodiment 3
[0050] A chlor-alkali production process, which is improved on the basis of Embodiment 1, and the pressure in the anode chamber is 72.8-75.3kPa.
[0051] According to the above-mentioned chlor-alkali production process, the obtained parameters are shown in the table below.
[0052]
[0053] It can be seen from the above that the negative pressure state is conducive to the release of chlorine gas from the anolyte, promotes the reaction process, increases the output of chlorine gas and caustic soda, and maintains negative pressure in the anode chamber to avoid chlorine gas leakage; at the same time, the air pressure in the anode chamber is 72.8-75.3kPa, avoiding the anolyte Boiling causes the water content in the wet chlorine gas to increase.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Login to View More
Abstract
The invention relates to the chlor-alkali industry, and discloses a chlor-alkali production process. The problems such as consumption increase of alkali quantity and light salt brine treatment quantity for subsequent treatment caused by the addition of acid in anodic liquor are solved. The chlor-alkali production process comprises the production steps that the anodic liquor is fed into an anode chamber of an electrolytic cell, circulating lye is fed into a cathode chamber to be as cathode liquor, after energization is carried out until the current is stabilized, acid is gradually added to theanode chamber, and the pH of the anode liquor is adjusted and maintained; after the temperature of the anode liquor and the cathode liquor is risen, the temperature of the anode liquor and the cathodeliquor and the indoor air pressure of the anode chamber and the cathode chamber are kept; chlorine gas produced above the anode chamber is sent to a chlorine gas treatment device, light salt brine isproduced, part of the light salt brine is mixed with a refined saturated NaCl solution to obtain anodic liquor, the anodic liquor is continuously supplemented to the anode chamber, and the other partof the light salt brine is sent to a dechlorination device; and acid consumption and the amount of the light salt brine which needs to be neutralized are reduced, the consumption of alkali used for neutralizing the acid is further reduced, and thus the internal consumption of the process is reduced.
Description
technical field [0001] The invention relates to the chlor-alkali industry, in particular to a chlor-alkali production process. Background technique [0002] The chlor-alkali process is an industrial method of electrolyzing saturated NaCl solution to prepare NaOH, Cl 2 and H 2 The existing production process mostly adopts the ion membrane method for production. The main principle of the ionic membrane method is that the cation exchange membrane used has a special selective permeability, allowing only cations to pass through and preventing anions and gases from passing through, that is, only H + 、Na + pass, while Cl - , OH - and the bipolar product H 2 and Cl 2 Can't pass. [0003] The existing ionic membrane production process is briefly described as follows. The secondary refined saturated brine from the secondary brine refining process enters the anode chamber of the electrolytic cell. At the same time, in order to reduce the oxygen content in the product chlorine, ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More