acid process


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acid process

[′as·əd ‚prä·səs]
(chemical engineering)
In paper manufacture, a pulp digestion process that uses an acidic reagent, for example, a bisulfite solution containing free sulfur dioxide.
(metallurgy)
A melting process carried out in a furnace lined with acidic materials which combine readily with the oxides in the ore.
References in periodicals archive ?
The aim of this work is to obtain cheaper and more pure boric acid than the sulfuric acid process with an environmentally friendly process without waste or waste of process can be evaluated in another way.
Concentrated acid process provides complete and rapid conversion of cellulose to glucose and hemicellulose to 5-carbon sugar with little degradation, but the critical factor is needed to make the process economically viable by optimizing sugar recovery and cost effectively recover the acid for recycling.
[10] Wayman, F.M and Mattey, M., 2000, "Simple diffusion is the primary mechanism for glucose uptake during the production phase of the Aspergillus niger citric acid process", Biotechnol.
In 1856, Henry Bessemer patents a bottom-blown acid process for melting low-carbon iron.
Although in this work in the slag-metal system nickel is absent, general principles of chrome distribution between the metal and the slag, depending upon activity of silicon in the metal and different basicity of slag, is of interest for acid process of ferronickel refining as well.
By acquiring DSM, SABIC gained one key technology - Stamicarbon - to add to three processes it has developed: the Acetic Acid process created at its R&T unit; Alpha-Sablin, developed jointly with Linde of Germany; and a new venyl acetate monomer process used at its semi-commercial acetic acid plant at Yanbu' on stream in 2004.
The results obtained from the acid process gelatin: protein (84.68%), moisture (11.42%), ash (2.08%), fat (1.71%), hydroxyproline (11%), pH (4.6), calcium (752 ppm), arsenic (ND), cupper (23.5 ppm), iron (25.77 ppm), zinc (7.74 ppm), CT (< 3 NMP/g), Salmonella (ausent) are between the permitted levels by official regulation, RTA (5 x [10.sup.3] UFC/g) and molds (2 x [10.sup.2] UFC/g), were higher than the permitted levels.
He says his process, which involves the transmethylation of vegetable oils to produce biodiesel methyl esters, "converts the fatty acids by an acid process [in] 30 minutes and then converts the triglycerides by a base process in seconds." It also meets biodiesel standards, uses a wide range of feedstocks including grease trap wastes, and incorporates a system that recovers and recycles process chemicals.
For silicon nitride removal, the industry has traditionally used a hazardous, 160 degrees Celsius to 180 degrees Celsius hot-phosphoric acid process in a wet bench.
Skin peels using the glycolic acid process are performed at the clinic.
Battista developed an acid process that cleaves off the hinges without attacking the crystals.