Abstract: The invention has disclosed a trifluoroacetoxylation agent and a preparation process of the agent, which is safe and ease to handle, very useful in industry, and represented by the formula (1); wherein R1 to R4 are a substituted or unsubstituted, saturated or unsaturated alkyl group or a substituted or unsubstituted aryl group and can be the same or different, R1 and R2 or R3 and R4 can bond to form a ring containing a nitrogen atom or a nitrogen atom and other hetero atoms, and R1 and R3 can bond to form a ring containing a nitrogen atom or a nitrogen atom and other hetero atoms.

Abstract: A preparation process of an acetylene derivative comprising reacting a compound having a skeleton represented by the formula (1): ##STR1## in the molecular formula with a compound represented by the formula (2): ##STR2## wherein R.sup.1, R.sup.2 R.sup.3 and R.sup.4 are individually an alkyl group having 1 to 6 carbon atoms and can be the same or different, R.sup.1 and R.sup.3 can bond each other to form a ring, and R.sup.1 and R.sup.2 or R.sup.3 and R.sup.4 can be bond each other to form one or two heterocyclic rings: or with a compound represented by the formula (3): wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same as in the formula (2), and X.sub.1 is a ##STR3## chlorine, bromine or iodine atom.

Abstract: In a process for producing tubular shaped fibrous articles of small diameter by heating and cooling a fibrous bundle containing at least 20 weight % of hot-melt-adhesive composite fibers, the improvements comprise using a shaping apparatus including an injecting chamber, an injecting hole formed in the wall of the chamber, a fibrous bundle outlet provided with a nozzle of a desired shape in cross-section, a cylindrical pipe for introducing the fibrous bundle, which has a cross-sectional area larger than that of the outlet, is located at a position opposite to the outlet and projects toward the outlet and terminates in the injecting chamber, and a core pipe which is open at its base on the outside of the injecting chamber, has its one end inserted through the cylindrical pipe and extending into the nozzle through the injecting chamber, and having a vent in its portion exposed within the injecting chamber, and passing the fibrous bundle through the cylindrical pipe to the outlet, while injecting a hot compresse

Abstract: A process for producing L-isoleucine, which comprises culturing a microorganism belonging to the genus Brevibacterium or the genus Corynebacterium which has a methyllysine resistance or .alpha.-ketomalonic acid resistance and which is capable of producing L-isoleucine in a liquid medium, and obtaining the accumulated L-isoleucine from said medium.

Abstract: A method for producing a hollow-cylindrically shaped fibrous article stabilized by hot adhesion and an apparatus suitable to produce the same are provided. Said method comprises passing a web of gathered fiber layer carried on a conveyer belt through a heating zone, heating said web in such a way that a lower-melting component of composite fiber contained in the lower part of said web contacting the conveyer belt is not in the molten state and a lower-melting component contained in the upper part of said web is in the molten state, while separating said web from the conveyer belt, winding up said web on a take-up rod or tube in such a way that the upper surface thereof occupies the inner side of the winding, while heating the web further, cooling the wound up article and drawing out the take-up rod or tube from the shaped product.The production method of the present invention is simple and does not require complicated apparatus and the resultant product is useful for filtration.

Abstract: A method for producing a hollow-cylindrically shaped fibrous article stabilized by hot adhesion and an apparatus suitable to produce the same are provided. Said method comprises passing a web of gathered fiber layer carried on a conveyor belt through a heating zone, heating said web in such a way that a lower-melting component of composite fiber contained in the lower part of said web contacting the conveyor belt is not in the molten state and a lower-melting component contained in the upper part of said web is in the molten state, while separating said web from the conveyor belt, winding up said web on a take-up rod or tube in such a way that the upper surface thereof occupies the inner side of the winding, while heating the web further, cooling the wound up article and drawing out the take-up rod or tube from the shaped product.The production method of the present invention is simple and does not require complicated apparatus and the resultant product is useful for filtration.