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A process for recovering a virtually water-free product-grade amine from an amine acid salt thereof contained in a spent acid stripping liquor, said amine having a boiling point significantly less than that of water and not forming …


Abstract. Sulfuric acid is widely used as raw material in various industries such as textile, pigment, dyes, metal processing, pharmaceuticals, pulp and paper industries,etc. Spent acid recovery process is designed to regenerate or recover sulfuric acid from a variety of spent acid containing a varying degree of contaminants.


the spent pickle liquor showed acid recovery rates of 84.8% and 91.2%, respectively. Although the recovery rate of acid is high, the quality of the acid is low (8% and 6.2%, see table).


Spent nitric acid from the hydroxylamine production process contains nitrous acid. Our nitric acid denitration process removes the nitrous acid as NOx, which can then be returned to the originating process or recovered as weak nitric acid.


spent cooking liquor is separated from the pulp. The pulp then proceeds through various stages of ... Potential sources of carbon monoxide emissions from the kraft process include the recovery ... 10.2.3 Acid Sulfite Pulping 10.2.3.1 Process Description - The production of acid sulfite pulp proceeds similarly to kraft pulping, except that ...


Disclosed is a process for recovering a virtually water-free amine from an amine acid salt thereof. The process comprises a unique combination of phase separation stages practiced under mild heating and distillation stages. An amine product containing less than 0.2% water can be achieved by the present process. The feedstock for the process suitably is an acid …


Process flowsheet description of spent sulfuric acid regeneration: Spent sulfuric acid contains metals, salts and organic compounds, and even after through treatments and washing their presence will disqualify in the quality control test for reuse of spent acid in the process.


The acid regeneration plant can also process hydrogen sulphide (H2S) gas from the refinery reducing the load on sulphur recovery plants (Claus plants). Water balance and low SO 2 concentrations are problems faced by acid


The acid regeneration or spent acid recovery process is designed to regenerate or recover sulphuric acid from a variety of spent acids containing a varying degree of contaminants. A typical sulphuric acid regeneration plant consists of three major components: 1.


The sulfuric acid solution used for de-rusting steel becomes "spent" when the iron impurities reach a level that begins to slow the pickling process. The Sulfuric Acid Recovery System continuously recycles acid by removing these impurities and maintaining a high quality, high speed pickling solution, thus never allowing iron levels that will ...


The pickling process generates a considerable quantity of spent pickle liquor (SPL) containing the dissolved metal salts of Iron, Chromium, Copper, Nickel and Zinc as well as residual free acid.


solvents in a single acid gas removal process. It employs two amines, MDEA as the main reactant and piperazine as the accelerator, ... recovery. The SULFEROX process is suited for handling gas streams that yield between 0.1 and 20 t of sulphur per day. FEATURES High iron concentrations, small liquid flows ...


The process regenerates HCl from pickling lines with 99% recovery rate. The ARP is specially designed to minimize the Capital cost, Operating cost, Maintenance cost with minimized spare parts. Neutralisation of waste acid, maintaining the pollution control standards for water/land/air, sludge handling/disposal and water consumption involves ...


Leaching, recovery, spent lithium-ion batteries, selective precipitation, solvent extraction, citric acid media Key Laboratory of Resources Chemistry of Nonferrous Metals, College of Chemistry and ...


In the fluidized bed acid regeneration process, the spent pickle liquor is thermally decomposed to convert the spent acid into hydrochloric acid and iron oxide at a high temperature in the presence of water vapor and oxygen as per equation (Eq.


STUDY OF SELECTED PETROLEUM REFINING RESIDUALS INDUSTRY STUDY Part 1 August 1996 U.S. ENVIRONMENTAL PROTECTION AGENCY Office of …


A process for the recovery of palladium from spent activated carbon-supported palladium catalysts was described. Palladium was extracted from the matrix of the spent catalyst with an acid mixture of dilute hydrochloric acid and hydrogen peroxide.


Predict the concentration profile of a hydrochloric acid recovery process through neural network models which is used to remove the Fe 2+ and Fe 3+ from pickling liquor, resulting in increasing the acid concentration for the reusing in the pickling process (Kittisupakorn et al. 2005).


Our Acid Technology Center is staffed with world-class experts in their field who work closely with our environmental, process safety and operational teams to solve operational, maintenance and technical challenges for our customers and operating sites.


Spent sulphuric acid and other sulphate compounds, previously regarded as waste, are an increasingly important source of sulphur dioxide for sulphuric acid manufacture. The sulphuric acid may have been used as a catalyst or drying agent, or in the preparation of metal surfaces for plating.


In a few cases, this spent acid may be safely disposed or used in other processes, but usually it must be regenerated back to relatively pure and concentrated acid for reuse in the main process…


Among them, the spent hydrolyzed sulfuric acid in the process of titanium dioxide production is an important raw material for the recovery of scandium (Xu and Li, 1996, Auer et al., 2003). In the production of titanium dioxide with the sulfuric acid method, the concentrated sulfuric acid …


Recovery of spent sulfuric and nitric acid helps to reduce operating costs compared to total raw material and disposal costs, and is an environmentally sound practice.


MIXED ACID RECOVERY with the APU ™ ACID SORPTION SYSTEM CRAIG BROWN, Prosep Technologies, Eco-Tec Inc., Pickering, Ontario ... success of the acid retardation process has been utilization of a novel ion exchange process called ... spent acid is pumped into the bottom of the resin bed. Acid is sorbed by the


Hydrochloric acid regeneration or HCl regeneration refers to a chemical process for the reclamation of bound and unbound HCl from metal chloride solutions such as hydrochloric acid.


Spent Sulfuric Acid — Spent sulfuric acid used to produce sulfuric acid, ... to the tar recovery process as a feedstock to produce coal tar, or mixed with coal tar prior to the tar's sale or refining. This exclusion is conditioned on there being no land disposal of the wastes from the point they are generated to the point they are ...


The new plant will allow Huntsman to use a wider range of feedstock to produce its TIOXIDE[R] and ALTIRIS[R] pigments, reduce the generation of gypsum in the process, and convert spent acid from TiO2 pigment manufacturing into iron sulfate products for the water treatment, animal feed, and cement markets.


Spent Acid Treatment items are specifi cally custom designed – so that clients' needs are fully satisfi ed. Chemetics capabilities range from carrying out Engineering Studies through to the ... dilute feed acid (<60 wt%), this process is often combined with a weak nitric acid concentration system.


generally use hydrochloric acid in the pickling process. Sulfuric acid is used by the smaller, secondary steel finishers. Although the amount of steel pickled ... processes for recovery of sulfuric acid from spent pickle liquor. All processes, however, rely upon the


REGENERATION OF SPENT ACID FROM CHEHICAL PROCESSES ... and process control system for spent acid plant. we Will give the client Quality features which sometimes also The The combination of cost reduction, energy recovery or improvement, and quality is brought about through continuous research and development. A


lena dahlgren treatment of spent pickling acid from stainless steel production a review of regeneration technologies with focus on the neutralisation process for implementation in chinese industry presented at industrial ecology …


Spent acid and/or hydrogen sulfide is decomposed by combusting the spent acid and hydrogen sulfide gases in a decomposition furnace. This produces SO 2 gas. Fuel is burned along with the spent acid in the combustion chamber, to achieve the required decomposition temperature.


Abstract The studies of acid purification and base purification via bipolar electrodialysis are presented. The process of acid recovery involved spent solutions of acid (HCl or H2SO4) and iron salt obtained in the course of conventional electrodialysis.