摘要:
Apparatus for the catalytic conversion of waste gases such as those which accumulate in the synthesis of vinyl chloride is presented in which the waste gases are successively treated at an elevated temperature with a catalyst for oxidative cracking and with a catalyst for oxidative afterburning.
摘要:
A method for the catalytic conversion of waste gases such as those which accumulate in the synthesis of vinyl chloride is presented in which the waste gases are successively treated at an elevated temperature with a catalyst for oxidative cracking and with a catalyst for oxidative afterburning. Apparatus for carrying out the method is also shown.
摘要:
Apparatus for carrying out a method for the catalytic conversion of waste gases such as those which accumulate in the synthesis of vinyl chloride is presented in which the waste gases are successively treated at an elevated temperature with a catalyst for oxidative cracking and with a catalyst for oxidative afterburning.
摘要:
A weaving machine for producing a woven fabric has a shedding device to form a loom shed of warp material, a weft insertion device for inserting a preferably tape-shaped or band-shaped weft material into the loom shed, a drawing-off device for drawing off the finished fabric in a drawing-off direction, fabric movement device for moving the fabric back and forth in the warp direction to bring the last inserted weft material into contact with the binding point or fabric edge. A shed limiter device limits the opening of the loom shed from above and below the warp, and is movable back and forth in the warp direction. The shed limiter device only loosely bounds the fabric and essentially without actively clamping or pinching or contacting the fabric and/or the last inserted weft material, at least while moving in the direction opposite the drawing-off direction.
摘要:
For weaving pattern formation of a woven fabric with weft threads (3), warp threads (1) and effect threads (2), data sets (20) are produced according to a method in which data values are derived from weft sequence numbers (30) and from positions of interlacing points (P) of an effect thread (2) with the weft threads (3) in the pattern repeat (29). These data sets (20) are supplemented by further data values (31, 32, 33, 34) derived from the weaving pattern, in such a manner so that they form a pattern draft (28) for a weaving pattern with additional weft effects. In a weaving machine with devices for slidingly displacing effect threads (2) in the weft direction (12), the weaving pattern formation is derived from the data sets (20) of this pattern draft (28).
摘要:
A door arrangement includes a first part, in particular a door leaf, a second part, in particular a door frame, on which the first part is pivotably articulated about a pivot axis, a closing hinge, which connects the first part and the second part, for a closing movement of the first part relative to the second part and a damping hinge connecting the first part and the second part, to damp the closing movement. The door arrangement can be displaced between a closed position, in particular in which the first part rests in a closing manner on the second part, and an opened position, in which the first part is pivoted at a pivoting angle that differs from zero about the pivot axis in relation to the second part.
摘要:
A catalyst and method of its production for use in making vinyl acetate monomer. The carrier is impregnated with a basic solution and a solution containing gold salts and palladium salts and finally impregnated with alkali acetate. The activity and selectivity of the catalyst, its mechanical strength, the noble-metal adhesion and the dispersion of noble metal on the carrier can be improved if the carrier is impregnated in a pretreatment with salts containing as cation elements of groups IA, IIA, IIIA and IVB of the periodic table and as anions elements of group VIIA or complex anions such as nitrate, sulfate or anions of organic acids such as acetate and lactate and is subsequently dried and calcined at temperatures of at least 160.degree. C.
摘要:
Polyoxyalkylene glycols are prepared by a process in which tetrahydrofuran is polymerized with a total of not more than 95 mol %, based on the amount of tetrahydrofuran used, of one or more comonomers from the group consisting of the cyclic ethers and acetals in the absence of water and in the presence of a monohydric alcohol or of a monocarboxylic acid with the aid of an anhydrous heteropoly acid catalyst, and the polyoxyalkylene glycol is liberated from the resulting polyoxyalkylene glycol monoethers or polyoxyalkylene glycol monoesters by cleavage of the monoether or monoester bond.
摘要:
A process for the reactivation of spent montmorillonite catalysts by thermal treatment, in which the spent catalysts are heated at a temperature of from 650.degree. to 850.degree. over a period of from 0.2 to 3 hours, and the montmorillonite catalysts thus obtained.
摘要:
Disclosed are one-piece, funnel shaped balloon holders, comprising a conical cup and a hollow cylindrical stem. A longitudinal slit extends the entire length of the balloon holder, from the upper edge of the cup to the lower end of the stem, to permit insertion of the neck of a balloon into the holder. A short slot at the bottom of the stem anchors the balloon tail. In a first embodiment (FIGS. 1-3), a balloon stick is inserted into the hollow stem. In a second embodiment (FIGS. 4-8) the stem is inserted into one end of a hollow balloon stick. The stem in this embodiment is of such shape as to provide space between the stem and the balloon stick for a portion of the balloon neck so that the entire balloon neck is concealed.