Matting acid

SYNS ACIDE SULFURIQUE (FRENCH) ACIDO SOLFORICO (ITALIAN) BOV DIPPING ACID HYDROOT MATTING ACID pOT) NORDHAUSEN ACID pOT) OIL of VITRIOL pOT) SCHWEFEL-SAEURELOESUNGEN (GERMAN) SPENT SULFURIC ACID pOT) SULPHURIC ACID VITRIOL BROWN OIL VITRIOL, OIL OF pOp ZWAVELZUURO-PLOSSINGEN pUTCH)... 

Matting acid, sulphuric acid when used as a matting agent. Matting is the process by which metals and other substrates have their surface sheen removed to leave a dull, lustreless finish. It can also be used to describe the use of sulphuric acid as an etchant. 

MAOH. See Methyl amyl alcohol Marble. See Calcium carbonate Mascagnite. SeeAmmonlum sulfate Matricaria camphor. See Camphor Matting acid. See Sulfuric acid MBC. See Carbendazim MBI. SeeMDI... 

Matrimid 5218. See Polyimide, thermoplastic Matrimid 5292A. See Bismaleimide Matrimid 5292B. See 0,0 -D allyl bisphenol A Mattex . See Kaolin, calcined Matting acid. See Sulfuric acid Matting Microblanc. See Calcium monocarbonate Maw oil. See Poppyseed oil Maxahibit lOCt, Maxahibit TT-50. See Sodium tolyltri azole... 

Matting acid Nordhausen acid Oil of vitriol Sulphuric acid Vitriol brown oil Vitriol, oil of... 

Dipping acid Matting acid Nordhaausen acid Spent sulfuric acid Schwefelsaureloesungen Vitriol brown oil Zwavelzuuroplossingen... 

Synonyms Mannitan, Z-9-octadecenoate Definition Monoester of oleic acid and anhydrides derived from mannitol Empirical C24H440g Uses Emulsifier, surfactant in cosmetics Manuf/Distrib. Somerset Cosmetic Co. Variati D-Mannitol, 1,4-anhydro-, 6-dodecanoate. See Mannitan laurate D-Mannitol, dianhydro-, mono-9-octadecenoate, (Z)- D-Mannitol, dianhydro-, monooleate. See Mannide monooleate MAOH. See Methyl amyl alcohol Marble. See Calcium carbonate Mascagnite. See Ammonium sulfate Matting acid. See Sulfuric acid Maxatase. See Protease MC. See Methylcellulose MCC. See Microcrystalline cellulose... 

The slurry is pumped iato another stock chest, where wax ia emulsion form, usually about 0.5—1.0% wax-to-fiber weight, and 1—3% PF resia are added. PF resia is also added on the basis of resia soHds-to-dry fiber. Thea a small amouat of alum is added, which changes the pH (acidity) of the slurry, causiag the resia to precipitate from solutioa and deposit on the fibers. Resia is required ia greater quantity than ia the Masonite process because only light bonding occurs between fibers prepared ia a refiner. The fiber slurry is thea pumped to the headbox of a Fourdrioier mat former, and from this poiat the process is similar to the Masonite process. 

More recentiy, sulfuric acid mists have been satisfactorily controlled by passing gas streams through equipment containing beds or mats of small-diameter glass or Teflon fibers. Such units are called mist eliminators (see Airpollution control methods). Use of this type of equipment has been a significant factor in making the double absorption process economical and in reducing stack emissions of acid mist to tolerably low levels. 

Figure 9.11 Amino acid sequences of homeodomains from four differenf franscription factors Anfp is from fhe Antennapedia gene in the fruitfly Drosophila, a2 is from the yeast Mat o2 gene, eng is from fhe engrailed gene in Drosophila and POU is from fhe POU homeodomain in the mammalian gene Oct-1. Residues colored green form the hydrophobic core of the homeodomain, blue form nonspecific interactions with the DNA backbone and red form contacts with the edges of the DNA bases.

Although this material is suitable for most purposes, it may be purified further in the following manner. It is dissolved by heating in a solution of 2 g. of stannous chloride and 2 cc. of concentrated hydrochloric acid in i 1. of water, and the hot solution is clarified by filtration through a 5-mm. mat of decolorizing carbon (Note g). The yellow or red color which may develop disappears on reheating to the boiling point. After the addition of 100 cc. of concentrated hydrochloric acid the solution is allowed to cool in an ice bath, treated with a second roo cc. of acid, cooled to 0°, and collected and washed as befor The ciystalline product is colorless, ash-free, and of analytical purity. The loss in the crystallization of an 80-g. lot amounts to 5-10 g. (6-12 per cent). 

Fig. 1. (a) Comparison of normalised electrical conductivity of individual MWCNTs (Langer 96 [17], Ebbesen [18]) and bundles of MWCNTs (Langer 94 [19], Song [20]). (b) Temperature dependence of resistivity of different forms (ropes and mats) of SWCNTs [21], and chemically doped conducting polymers, PAc (FeClj-doped polyacetylene [22]) and PAni (camphor sulfonic acid-doped polyaniline [2. ]) [24]. 

The basic materials are sufficiently stable in sulfuric acid not to require the expensive phenolic resin impregnation. Traces of adhesive are applied to hold the glass mat in order to achieve the total thickness. This separation system may be expensive to manufacture, a fact certainly largely balanced by savings in positive active mass, but it also has some indisputable advantages. 

A solution of 615 g. (3 moles) of /3-bromoethylamine hydrobromide (p. 13) and 416 g. (3.3 moles) of anhydrous sodium sulfite (u. s. p.) (Note) in 2400 cc. of water is concentrated on the steam bath to a minimum volume (thirty-six to forty-eight hours). After the mixture has cooled, the cold moist cake is triturated with 1500 cc. of concentrated hydrochloric acid and collected on an asbestos mat in a Buchner funnel. The precipitate is washed ten times with 150-cc. portions of concentrated hydrochloric acid. The filtrate is mixed well, decanted from precipitated salts if necessary, and concentrated over a free flame to a volume of 600 cc. 

This procedure for the synthesis of ethyl 3-nitroacrylate is essentially that of Stevens and Emmons.2 Four major changes have been introduced by the submitters rapid introduction of dinitrogen tetroxide no purification of the intermediate nitro iodo ester use of dry, finely powdered sodium acetate for elimination of hydroiodic acid and percolation of the final product through a mat of alumina. With these modifications, the preparation is reproducible and highly efficient (80-90% overall). 

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