摘要:
1. A process for the purification of cyclotetramethylene tetranitramine which comprises heating a portion of crude cyclotetramethylene tetranitramine in the presence of linear nitramines in acetic acid, the acid concentration being at least 98 percent, to a temperature of from about 50 to 98*C., maintaining the resulting slurry for a period of about 15-45 minutes at said temperature from about 50 to 98*C., cooling the slurry to a temperature of about 30 to 40*C., adding to said slurry a new increment of said crude cyclotetramethylene tetranitramine, repeating the same cycle for a series of from 5 to 10 increment additions, and recovering a cyclotetramethylene tetranitramine product of high purity.
摘要:
Process for the decontamination of reaction solutions which are contaminated with dissolved organic crystalline explosives, particularly those explosives commonly known as RDX and HMX. The process involves the selective adsorption of the dissolved explosives on activated carbon.
摘要:
Substrates for null-lactamase of the general formula I 1 in which one of X and Y is a fluorescent donor moiety and the other is a quencher (which may or may not re-emit); Rnull is selected from the group consisting of H, lower (i.e., alkyl of 1 to about 5 carbon atoms) and (CH2)nOH, in which n is 0 or an integer from 1 to 5; Rnull is selected from the group consisting of H, physiologically acceptable metal and ammonium cations, nullCHR2OCO(CH2)nCH3, nullCHR2OCOC(CH3)3, acylthiomethyl, acyloxy-alpha-benzyl, delta-butyrolactonyl, methoxycarbonyloxymethyl, phenyl, methylsulphinylmethyl, beta-morpholinoethyl, dialkylaminoethyl, acyloxyalkyl, dialkylaminocarbonyloxymethyl and aliphatic, in which R2 is selected from the group consisting of H and lower alkyl; A is selected from the group consisting of S, O, SO, SO2 and CH2; and Znull and Znull are linkers for the fluorescent donor and quencher moieties. Methods of assaying null-lactamase activity and monitoring expression in systems using null-lactamase as a reporter gene also are disclosed.
摘要:
A process for the separation of HMX (cyclotetramethylenetetranitramine) from mixtures of RDX (cyclotrimethylenetrinitramine) and HMX whereby said mixtures are dissolved in hot, water-saturated cyclopentanone and the RDX and HMX are thereafter selectively precipitated.
摘要:
RECOVERY OF HMX IN GOOD CONCENTRATIONS IS ACHIEVED FROM RDX-HMX ADMIXTURES BY PREFERENTIAL CRYSTAL GROWTH OF RDX IN SPENT ACID AND SUBSEQUENT SEPARATION OF THE FINE CRYSTALS OF HMX BY PHYSICAL METHODS. THE SPENT ACID WILL NORMALLY COMPRISE 60 TO 86, ACETIC ACID, 1 TO 2% NITRIC ACID, 1 TO 3% FORMIC ACID AND 1 TO 2% AMMONIUM NITRATE.