A waste sulfuric acid recycling device and 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 technology for recovery and treatment of waste sulfuric acid, which is applied in the direction of magnesium sulfate, bisulphate preparation, sulfate/bisulfate preparation, etc., can solve problems such as improper process, no economic feasibility, different material composition and ratio, etc. Reach the effect of low cost recycling
Active Publication Date: 2020-06-30
山东齐创石化工程有限公司
View PDF12 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
However, due to the different sources of waste acid, the complex composition is different from the production of various sulfates from commercial sulfuric acid
A small amount of organic matter and other components in waste acid have a great impact on the production of sulfate, especially the removal of a small amount of impurities. The existence of a small amount of impurities has a great impact on the salt formation, crystallization, and product quality of sulfuric acid. It is difficult to produce qualified products if the process is improper.
[0008] Due to the different sources of waste sulfuric acid, the composition and ratio of substances in the waste sulfuric acid are different. The waste sulfuric acid encountered by the applicant contains 75-80% sulfuric acid, 5-10% potassium bisulfate, 0.2-0.5% If boron trifluoride and other organic substances are directly recovered from potassium hydrogen sulfate, the crystallization and separation conditions are harsh, the separation is difficult, and the equipment investment is huge, so it is not economically feasible.
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
[0031] A method for recovering and treating waste sulfuric acid. The waste sulfuric acid contains 75-80% sulfuric acid, 5-10% potassium bisulfate and 0.2-0.5% boron trifluoride. The treatment method comprises the following steps:
[0032] S1: Transfer waste sulfuric acid to the defluorination reactor, add defluorination additives for defluorination pretreatment; Harmless fluoride. The waste acid is accurately metered into the defluorination reactor, and the defluorination aid is added through the control system according to the analysis data, and the defluorination waste acid enters the reactor.
[0033] S2: Transfer the pretreated waste sulfuric acid to the reactor, add magnesium oxide into the reactor, react until the pH value reaches neutral, add iron remover and flocculant while stirring, continue the reaction, add iron remover and Flocculation makes iron and other impurities form precipitates, removes iron and most of the impurities, and the tail gas discharged from the ...
Embodiment 2
[0040] A recovery and treatment device for waste sulfuric acid, comprising a waste sulfuric acid storage tank 1, a defluorination reactor 2, an absorption tower 3, a reaction kettle 4, a filter press 5, activated carbon filter equipment 6, a first crystallization kettle 7, a first centrifugal separation machine 8, the second crystallization kettle 9, mother liquor transfer tank 10, the second centrifuge 16, waste residue storage tank 11, the first dryer 12, magnesium sulfate storage tank 13, the second dryer 14 and magnesium sulfate potassium storage tank 15. The reaction kettle 4 is a reaction kettle 4 with a stirring function, and the reaction kettle 4 is also provided with an iron removal agent feeding port and a flocculant feeding port. Both the first centrifugal separator 8 and the second centrifugal separator 16 are automatic continuous separators.
[0041] The waste sulfuric acid storage tank 1 is used to store the waste sulfuric acid to be recovered, the defluorinatio...
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 a recovery and treatment method of waste sulfuric acid, comprising S1: performing defluorination pretreatment on waste sulfuric acid; S2: transferring waste sulfuric acid to a reaction kettle, adding magnesium oxide for reaction; S3: performing pressure filtration on the reaction solution, and transferring the waste residue to Waste residue storage tank, the filtrate is transferred to activated carbon filtration equipment; S4: The mother liquor of magnesium sulfate is separated from the first crystallization tank to detect the content of potassium bisulfate. According to whether the content of potassium bisulfate in the mother liquor reaches the predetermined threshold, it is decided whether the mother liquor should continue to circulate or recover sulfuric acid Potassium hydrogen is recycled. The method and device of the present invention can realize the recovery of potassium hydrogensulfate in waste sulfuric acid, and through the circular purification of the mother liquor, when the concentration of potassium hydrogensulfate in the mother liquor does not reach the threshold value, the mother liquor is returned to the reactor to continue to increase the potassium hydrogensulfate of the mother liquor Concentration, when the concentration of potassium bisulfate in the mother liquor reaches the threshold, the mother liquor is transferred to the crystallization tank, magnesium oxide is added to generate potassium magnesium sulfate and the material is separated and discharged, realizing the low-cost recovery of potassium bisulfate in waste sulfuric acid.
Description
technical field [0001] The invention relates to the technical field of waste acid recovery, in particular to a waste sulfuric acid recovery treatment device and process. Background technique [0002] The annual production of waste sulfuric acid in China exceeds 30 million tons. Most of the waste sulfuric acid contains organic matter and cannot be used directly. The existing technology for treating waste sulfuric acid from organic matter is mainly to crack and regenerate sulfuric acid for reuse. The investment in equipment is huge, and the cost per ton of waste sulfuric acid is extremely high. High production costs and huge losses have brought great pressure on the cost and environment of production enterprises, and are the biggest problems plaguing the production of enterprises. Others include extraction and other treatment processes, which involve the cost of extraction solvent recovery and low sulfuric acid content. Few enterprises apply them. Therefore, seeking economical...
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