摘要:
A process is described for producing bacteria having a high nitrilase activity comprising incubating bacteria having an ability to produce nitrilase, wherein the improvement comprises using a culture medium containing a water soluble iron compound.
摘要:
A process is described for producing acrylamide from acrylonitrile using an immobilized microorganism containing gel, which comprises immobilizing a microorganism having nitrilasic activity with a cationic acrylamide-based polymer gel and bringing acrylonitrile into contact with the immobilized microorganism gel in an aqueous medium containing substantially no salt.
摘要:
A method is described for producing acrylamide from acrylonitrile by the action of a microorganism having nitrilase activity in an aqueous medium, which comprises conducting the reaction in the presence of an alkali metal sulfate at an ionic activity of from 0.004 to 0.01 mole per liter while controlling the pH of said aqueous medium within a range of from 7 to 9 with an alkali hydroxide.
摘要:
A process for producing a partially hydrolyzed polyacrylamide which has a high molecular weight and high water solubility and can be suitably used as a flocculant for water treatment and a size for paper manufacture comprising polymerizing an aqueous solution of an acrylamide monomer in the presence of an alkali metal hydroxide such as sodium hydroxide and boric acid, whereby a partial hydrolysis of the polymer formed is also conducted substantially simultaneously with the polymerization. In an additional embodiment, a maturing of the polyacrylamide produced can be conducted by continuing to heat the polymer solution to increase the hydrolysis percentage.
摘要:
A structure having a movable dome-type roof including a plurality of independently movable shell sections which nest one beneath the other. A frame superstructure is arched over the dome to support the upper ends of the shell sections. The lower edges of the shell sections are mounted on self-powered carriages and are independently shiftable about a circular base of the structure. By selectively shifting individual shell sections, the dome may be contracted or expanded as desired. The superstructure may be mounted on a circular track or on a pair of linear tracks to expedite the opening and closing of the dome.
摘要:
A process for producing a substantially nonionic water-soluble acrylamide polymer produced without the occurence of hydrolysis of the acrylamide polymer by heating when the reaction system undergoes an unavoidable heat aging such as due to heat of polymerization comprising polymerizing a comparatively high concentration aqueous solution of acrylamide in the presence of a specific water-soluble nitrogen compound.
摘要:
Compounds having the formula ##STR1## wherein X represents a halogen atom, nitro, methyl, or trifluoromethyl group; Y represents a halogen or hydrogen atom or methyl group; and Z represents a halogen atom are useful as agricultural chemicals and pharmaceuticals.
摘要:
In the production of a dried acrylamide polymer by polymerizing, in an aqueous medium, acrylamide alone or a monomer mixture comprising 50 mole % or more of acrylamide and at least one monomer copolymerizable therewith with a radical initiator, and then drying the resulting hydrous acrylamide polymer, the allowing of at least one of the following compounds [I], [II] and [III] to be present in the drying step or a step prior thereto enables the dried acrylamide polymer having a high molecular weight and a good dissolvability in water to be obtained:[I] a non-polymerizable compound having in its molecule at least one group represented by the formula, ##STR1## wherein R.sub.1 is H or an alkyl group having up to 4 carbon atoms, [II] a compound represented by the formula, R.sub.2 --S--C.sub.n H.sub.2n X wherein n is an integer of 1 to 8, R.sub.2 is an alkyl group, an aryl group or --C.sub.n H.sub.2n X, in which X is --OH, --COOH (or its salt), --CN or --CONH.sub.2, and[III] a compound represented by the formula, ##STR2## wherein R.sub.3, R.sub.4 and R.sub.5 are H, alkali metals or alkyl or aryl groups.
摘要翻译:在水性介质中单独使用丙烯酰胺或含有50摩尔%以上丙烯酰胺的单体混合物和至少一种可与其自由基引发剂共聚的单体的聚合反应生产干燥的丙烯酰胺聚合物,然后干燥得到的含水丙烯酰胺聚合物 ,允许至少一种以下化合物[I],[II]和[III]化合物存在于干燥步骤或之前的步骤中,使得干燥的丙烯酰胺聚合物具有高分子量和在水中的良好溶解性 [I]在其分子中具有至少一个由下式表示的基团的非聚合性化合物,其中R 1为H或具有至多4个碳原子的烷基,[II]表示的化合物 其中n为1〜8的整数,R 2为烷基,芳基或-C n H 2n,其中X为-OH,-COOH(或其盐),-CN或 - CONH 2和[III]由下式表示的化合物,其中R 3,R 4和R 3 5是H,碱金属或烷基或芳基。
摘要:
In the production of a dried acrylamide polymer by polymerizing, in an aqueous medium, acrylamide alone or a monomer mixture comprising 50 mole % or more of acrylamide and at least one monomer copolymerizable therewith with a radical initiator, and then drying the resulting hydrous acrylamide polymer, the allowing of 2-mercaptobenzimidazole to be present in the drying step or a step prior thereto enables the dried acrylamide polymer having a high molecular weight and a good dissolvability in water to be obtained.
摘要:
Process for purifying an acrylamide including the steps of (1) adding an inorganic base (excluding ammonia) to an aqueous solution containing 15 to 60% by weight of the acrylamide at a temperature of up to 60.degree.C in an amount of 0.1 to 1.5 wt. % based on the acrylamide and (2) blowing a gas, inert to the acrylamide, into the resulting mixture at a hydrogen ion concentration of a pH of 12 to 13.7 and if necessary, (3) subjecting the so treated acrylamide solution to an active carbon adsorption treatment.