Solvents butyl mercaptan

Smaller uses of 1-butene are in 1,2-butylene oxide, butyl mercaptan, and butyl phenols. Butylene oxide, produced by the chlorohydrin process, is used as a corrosion inhibitor in chlorinated solvents. Butyl mercaptan is a precursor for organophosphate herbicides, pharmaceutical intermediates, and is used as a gas odorant. 

Paint and varnish manufacturing Resin manufacturing closed reaction vessel Varnish cooldng-open or closed vessels Solvent thinning Acrolein, other aldehydes and fatty acids (odors), phthalic anhydride (sublimed) Ketones, fatty acids, formic acids, acetic acid, glycerine, acrolein, other aldehydes, phenols and terpenes from tall oils, hydrogen sulfide, alkyl sulfide, butyl mercaptan, and thiofen (odors) Olefins, branched-chain aromatics and ketones (odors), solvents Exhaust systems with scrubbers and fume burners Exhaust system with scrubbers and fume burners close-fitting hoods required for open kettles Exhaust system with fume burners... 

Beilstein Handbook Reference) BRN 0505947 EINECS 200-890-2 HSDB 1611 t-Butyl mercaptan tert-Butanethiol tert-Butyl mercaptan tert-Butylthiol tertiary-Butyl mercaptan. Has skunk-like odor. Used as additive to natural gas for leak detection. Liquid mp = -0.5° bp = 64.3° d = 0.7943 soluble in organic solvents, insoluble in H2O. Lancaster Synthesis Co. Mallinckrodt Inc. Sigma-Aldrich Fine Chem. 

More than 500,000 kilograms (1 million pounds) of the butyl mercaptans are produced each year in the United States. Their primary uses are as solvents and in the preparation of other organic compounds, especially insecticides and herbicides. Among their other uses are ... 

FIGURE 3.3 Effect of chain transfer to various solvents on the degree of polymerization of polystyrene at 333 K. 1, Benzene 2, -heptane 3,. rec-butyl benzene 4, /n-cresol 5, CC34 6, CBr4 7, n-butyl mercaptan. 

Dipropylene glycol Sodium xylenesulfonate solvent, DDT 1-Chloronaphthalene solvent, decaffeinating coffee Perchloroethylene solvent, defoliants n-Butyl mercaptan solvent, degreasers... 

Free-radical polymerization can be terminated with a transfer agent such as benzoquinone which consumes free radicals. Mercaptans (thiols) such as butyl mercaptans are commonly used transfer agents. Free radicals at macromolecule chain ends can selectively react with transfer agents to terminate chain growth but the free radical is transferred to another macromolecule that continues to grow. Transfer can occur with the initiator, monomer, macromolecule, and solvent. Monomer propagation and transfer to the monomer are... 

Experiments were carried out in our laboratory to find the optimal conditions for the nucleophilic displacement of chlorine from PVC suspended in water. Nucleophiles such as diethyl dlthio-carbamate, lauryl thiolate and 2-(2 -butoxyethoxy)-ethane thiol, lauryl mercaptan, n-butyl mercaptan, benzyl mercaptan and bls-.(2-mercaptoethyl)-ether were used in these experiments. The results indicated that a higher percentage of substitution occurs if a solvent for PVC such as DMF or cyclohexanone is added to the slurry. 

In a manner largely complementary to secondary amine-catalyzed asymmetric conjugate addition to enals with heteroatom nucleophiles, chiral primary amines were recently found to be the catalysts of choice for similar Michael addition to a,p-unsaturated ketones. With their previously developed cinchona-type catalyst 91, Melchiorre and coworkers achieved the asymmetric sulfa-Michael addition to a,p-unsaturated ketones with either benzyl or tert-butyl mercaptane (Scheme 5.30) [58a]. The same catalyst could be further extended to oxa-Michael addition to enones by optimizing the ratio of acidic additive and solvents (Scheme 5.30) [58b]. 

Mercaptans are oxidised to disulphides by peroxodisulphate. Eager and Winkler studied the kinetics of the oxidations of n-butyl, n-octyl, and n-dodecyl mercaptans in acetic acid/water solvent (80 ml acid-I-20 ml water) and found first-order kinetics with respect to peroxodisulphate. The first-order rate coefficient increases with increase of mercaptan concentration, and reaches a limit at about 5 x 10 Af mercaptan. A decrease in the first-order rate coefficient with increase of the initial peroxodisulphate concentration was observed and attributed to a salt effect. Eager and Winkler suggested a mechanism involving sulphate radical ions. Levitt proposed a mechanism involving sulphur te-troxide, but there is no evidence for its formation in peroxodisulphate oxidations. 

The polybutadiene used was Intene from I. S. Rubber [77] = 2.1 dl/g in cyclohexane at 30°C. Vinyl chloride and styrene monomers from Montedison were 99.99 and 99.5% pure respectively. Azobis(isobutyronitrile) (AIBN) from Fluka was 99% pure. Di-te/t-butyl peroxide was 95% pure. Tert-butyl peracetate was used at a 50% dilution with dimethyl phthalate. The n-butyl ester of 3,3- (di-te/t-butylperoxy)valerianic acid was 85% pure. Terf-dodecyl mercaptan, a commercial product of the Societe Nationale des Petroles d Aquitaine, was used as a modifier. The solvents used were commercial products purified by fractionation. 

These are protic compounds (such as water and alcohols), nitriles (such as acetonitrile and propionitrile), common pollutants of FCC C4 cuts, aprotic solvents (coming from butadiene extraction processes), oxygenates (namely dimethyl ether and tert-butyl ethers from the upstream isobutene extraction), mercaptans, sulfides, and disulfides. They all have to be eliminated. Acetylenics and dienes must be severely limited. The lower the content of these pollutants in Standalone Difasol feedstock, the longer the chloroaluminate IL lifetime. 

In this example butyl glycol is mixed with butanol. Depending upon the ratios, the reflux temperature will be mo fied. Chain transfer agent tertiary dodecyl mercaptan is present to control molecular weight. The initiator is added separately being slurried with solvent. 

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