40 results about "DBNPA" patented technology

Methods for controlling the growth of bacteria in ethanol fermentation systems with antibiotic alternatives, which can be nonoxidizing biocides, stabilized oxidizers, or any combinations thereof, are described. As an option, a process or composition of the present invention can include one or more polycyclic antibacterial peptides. The methods can provide improvements, such as increased ethanol yields with minimal carryover of biocide into co-products of the processes.

The present invention discloses novel biocide composition comprising 2,2-dibromo-3-nitrilopropionamide (DBNPA) being in the form of a stable aqueous suspension. Further are disclosed the preparation of these compositions and their biocidal uses.

Provided is a method for suppressing slime in a reverse osmosis membrane apparatus, the method achieving the advantageous effect of suppressing generation of slime (a biofilm) and by which the advantageous effect of removing slime (a biofilm) can be achieved in a short time even if slime (a biofilm) is generated and adheres to a surface of a reverse osmosis membrane. This method for suppressing slime is used in a reverse osmosis membrane apparatus and has a water-passing step for passing water to be treated through the reverse osmosis membrane. The water-passing step includes a first water-passing step in which a slime suppressing agent X which contains 2,2-dibromo-3-nitrilopropionamide (DBNPA) and a slime suppressing agent Y which contains at least one type selected from the group consisting of components (A) to (D) (which are as described in the description) are added to the water to be treated which has a pH of 10 or less, and the water to be treated, which contains the slime suppressing agent X and the slime suppressing agent Y, is passed through the reverse osmosis membrane.

The invention relates to a sterilization method capable of preventing a reverse osmosis membrane from being polluted and plugged by microbe. The sterilization method mainly comprises the steps of adding an oxidizing sterilizing agent NaClO (5%) solution to a raw water tank continuously; adding a reducing agent NaHSO3 (35% W / V) solution continuously after ultra-filtration; removing residual chlorine thoroughly; controlling a pH value of inlet water at a reverse osmosis inlet between 7.1 and 7.4; monitoring and controlling ORP before a security filter between 200 mv and 300 mv; and sterilizing by carrying out preventative addition of a non-oxidizing sterilizing agent DBNPA solution with a concentration of 50 ppm continuously for one hour once every week in the above flow according to the quick killing characteristic of the non-oxidizing sterilizing agent DBNPA. Meanwhile, NaClO addition to the raw water tank is stopped. The sterilization method mainly takes use of the oxidizing sterilizing agent accompanied by two non-oxidizing sterilizing agents to carry out preventative sterilization alternatively, controls drug tolerance and resistance of the microbe, can effectively prevent and control propagation and excessive multiplication of the microbe on the surface of the reverse osmosis membrane, thereby preventing the reverse osmosis membrane from being polluted and plugged by the microbe.

The invention provides a disinfectant composition containing DBNPA, comprising: 10-20wt% DBNPA, 24-39wt% organic solvent, 39-63wt% water, 1-3wt% stabilizer and 0.04-0.08wt% % regulator. The present invention also provides a preparation method of the DBNPA-containing disinfectant composition. The disinfectant composition of the present invention adopts a lower amount of organic solvent than that in the prior art, and obtains better stability.

A dispersion of 2,2-dibromo-3-nitrilopropionamide (“DBNPA”) particles in a restrictedly viscosified concentrated brine solution effectively negates gelling of the brine solution because the naturally occurring gum used does not exhibits Ellis-Plastic behavior in the concentrated brine at a pH of from about 1 to 4. Because the DBNPA particles are much less soluble in the brine than in water, the particles are held in the stable dispersion. Moreover, a dispersion of DBNPA particles in viscosified brine provides at least the same biocidal effect as a solution of DBNPA, relative to the same concentration of DBNPA in solution in glycol, but also concurrently nullifies the degradation of the DBNPA during storage so that the loss due to hydrolysis of the DBNPA is less than 3% over a period of three months at a temperature in the range from −5° C. to 25° C. A process is disclosed for making the dispersion which can be stored at a temperature in the range from about −5° C. to 25° C. for up to three months with less than 3% by weight of the DBNPA particles settling out, and with less than 3% degradation of the DBNPA, provided the desired salt solution is made first and the remaining ingredients added thereafter.

The invention provides a composite antisludging agent of a reverse osmosis / nanofiltration system. The composite antisludging agent comprises the following components in percentage by weight: 2%-10% of cyclodextrin solution, namely a component I, 80%-90% of at least one or a mixture of amino trimethylene phosphonic acid (ATMP), a copolymer of maleic anhydride-acrylic acid (MA-AA), 2-phosphonic acid butane-1, 2,4-tricarboxylic acid (PBTCA), and hydroxyl ethylidene diphosphonic acid (HEDP), namely a component II, and 1%-10% of 2,2-dibromo-2-cyano-acetamid (DBNPA), namely a component III. The composite antisludging agent is prepared by mixing the component II and the component III, and then fusing the obtained mixture with the component I. When being applied to the reverse osmosis / nanofiltration / ultrafiltration system, the composite antisludging agent can be used for effectively relieving the pollution to the reverse osmosis / nanofiltration / ultrafiltration system caused by polcard, calcium sulphate salt, barium sulfate, strontium sulfate, calcium fluoride, colloidal iron and colloidal silica, relieving biological contamination simultaneously, improving the working efficiency of the system, prolonging the cleaning period and the service life of the reverse osmosis / nanofiltration / ultrafiltration system, and reducing the cost of reverse osmosis.

The present invention is directed to a composition for treating recirculating water systems, comprising: (1) a biocidal effective amount of a first nonoxidizing biocide comprising biguanide; and (2) a biocidal effective amount of a second nonoxidizing biocide comprising dibromonitrilopropionamide (DBNPA); wherein the composition is substantially free from oxidants. The present invention is also directed to a method of controlling the growth of microorganisms in recirculating water systems, comprising the step of treating the recirculating water systems with the above composition.