625 results about "Ph control" patented technology

A method is given for treating a subterranean formation penetrated by a wellbore with a viscosified fluid. The fluid contains a solid hydrolysable polyacid that upon dissolution and hydrolysis releases an acid that is a breaker for the viscosifying system. Suitable solid hydrolysable polyacids include polylactic acid and polyglycolic acid. The fluid also contains a pH control agent, present in an amount sufficient to neutralize any acid present in the solid hydrolysable polyacid before the injection and to neutralize any acid generated by the solid hydrolysable polyacid during the injection, so that the acid breaker is not available to break the fluid during the injection. In one embodiment the viscosifier is a viscoelastic surfactant fluid system and the solid hydrolysable polyacid is of a size selected to be a fluid loss additive, for example in fracturing or gravel packing. In another embodiment, the solid hydrolysable polyacid is used in particles sufficiently small that they enter the pores of the formation. In either case, the viscosifier is broken after the solid releases more acid than can be neutralized by the pH control agent.

Provided herein is a pad for treating eye conditions comprising a multipart container having an impermeable outer membrane sized to fit generally within the peri-orbital region and sufficiently flexible to mold to the eye; a first chemical in a first storage area in the multipart container; a second chemical in a second storage area in the multipart container, the first and second chemicals selected to have an exothermic reaction when mixed for producing a temperature suitable for treating eye conditions, the exothermic reaction providing the suitable temperature for a period of time suitable for treating eye conditions; and an inner membrane for initially separating the first and second chemicals, the inner membrane being renderable permeable, without causing the impermeable outer membrane to become permeable, to permit mixing the first and second chemicals to cause the exothermic reaction. This multipart container is covered with a soft, non-abrasive, lint-free material which is presoaked in a pH controlled antibacterial soap with or without an antibiotic.

Provided herein is a pad for treating eye conditions comprising a multipart container having an impermeable outer membrane sized to fit generally within the peri-orbital region and sufficiently flexible to mold to the eye; a first chemical in a first storage area in the multipart container; a second chemical in a second storage area in the multipart container, the first and second chemicals selected to have an exothermic reaction when mixed for producing a temperature suitable for treating eye conditions, the exothermic reaction providing the suitable temperature for a period of time suitable for treating eye conditions; and an inner membrane for initially separating the first and second chemicals, the inner membrane being renderable permeable, without causing the impermeable outer membrane to become permeable, to permit mixing the first and second chemicals to cause the exothermic reaction. This multipart container is covered with a soft, non-abrasive, lint-free material which is presoaked in a pH controlled antibacterial soap with or without an antibiotic.

A container has an impermeable outer membrane sized to fit generally within the peri-orbital region and sufficiently flexible to mold to the structure of the closed eye. Heat which is generated by an exothermic reaction inside the container, which provides steady-state heat to the eyelids. A soft, non-abrasive, lint-free material is presoaked in a pH controlled (preferably antibacterial and hypoallergenic) detergent, with or without an ophthalmic antibiotic solution. The compress may also have a handle which makes holding and maneuvering the compress more feasible, while protecting the user's fingers from the heat, and preventing the contamination of the compress by the fingers. The compress may be packed in a watertight, sterile wrapper which will prevent drying of the detergent solution. Other embodiments are also described and claimed.

Methods for enhancing the mesoporosity of a zeolite-containing material. Such methods may comprise contacting a composite shaped article containing at least one zeolite and at least one non-zeolitic material with at least one pH controlling agent and at least one surfactant. Such methods may be performed under conditions sufficient to increase the pore volume of at least one 10 angstrom subset of mesoporosity.

The invention provides a method for large-scale production of a polypeptide, such as a Factor VII or Factor VIIa polypeptide, in eukaryote cells, such as mammalian cells, contained in a culture liquid, said method comprising: monitoring the concentration of dissolved CO2 in the culture liquid, and constantly or intermittently sparging atmospheric air through the culture liquid, wherein the sparging rate of the air is controlled in relation to the monitored concentration of dissolved CO2 in the culture liquid. The method reduces or eliminates the use of bases while providing an excellent pH control. The invention also provides a culture vessel suitable for the methods.

The present invention provides a variety of microscale bioreactors (microfermentors) and microscale bioreactor arrays for use in culturing cells. The microfermentors include a vessel for culturing cells and means for providing oxygen to the interior of the vessel at a concentration sufficient to support cell growth, e.g., growth of bacterial cells. Depending on the embodiment, the microfermentor vessel may have various interior volumes less than approximately 1 ml. The microfermentors may include an aeration membrane and optionally a variety of sensing devices. The invention further provides a chamber to contain the microfermentors and microfermentor arrays and to provide environmental control. Certain of the microfermentors include a second chamber that may be used, e.g., to provide oxygen, nutrients, pH control, etc., to the culture vessel and / or to remove metabolites, etc. Various methods of using the microfermentors, e.g., to select optimum cell strains or bioprocess parameters are provided. The invention provides microreactors having a variety of different designs, some of which incorporate active stirring and / or have the capability to operate in batch or fed-batch mode. The invention further provides an apparatus and methods for simultaneous operation of a plurality of microreactors, with monitoring of the individual microreactors during a run. The invention further provides methods of performing gene expression analysis on cells cultured in microreactors.

This invention provides a masking material that can be used to protect an underling surface (e.g. an automobile surface) during an overcoating (e.g. painting) operation. The masking material in one embodiment includes a thickener and a pH control agent and water. The masking material can be applied to a surface that is to be protected from paint overspray or other coating processes, allowed to dry, and the surface then coated (e.g. with paint). After drying of the paint, or other coating, the masking material can removed by water washing.

One aspect of the present invention relates to a method of coating a surface, comprising sequentially depositing on a surface, under pH-controlled conditions, alternating layers of polymers to provide a coated surface, wherein a first polymer is selected from the group consisting of pH dependent cationic polyelectrolytes and neutral polymers, and a second polymer is selected from the group consisting of anionic polyelectrolytes, thereby permitting or preventing cell adhesion to said coated surface. In certain embodiments, the aforementioned method provides a coated surface to which cell adhesion is permitted. In certain embodiments, the aforementioned method provides a coated surface to which cell adhesion is prevented. Another aspect of the present invention relates to a method of rendering a surface cytophilic, comprising the step of coating a surface with a polyelectrolyte multilayer film, which film swells to less than or equal to about 150% of its original thickness when exposed to an aqueous medium. Another aspect of the present invention relates to a method of rendering a surface cytophobic, comprising the step of coating a surface with a polyelectrolyte multilayer film, which film swells to greater than or equal to about 200% of its original thickness when exposed to an aqueous medium.

The present invention provides reactor designs, component designs, and operating schemes for removing nitrates and chemical oxygen demand from any suitable wastewater stream. The invention also provides reactor designs, component designs, and operating schemes designed to modify and improve pH and water quality in wastewater streams.

In one embodiment, the present invention introduces integrated fluid injection and mixing devices to enable pH control in a miniature parallel integrated bioreactor array system. In another embodiment, the environmental conditions of the growth chamber is enabled through fluidic injections in a miniature parallel cell culture system. In still another embodiment, the present invention utilizes gas switches to control oxygen concentration within a miniature parallel integrated bioreactor array.

An electrolytic device for the generation of hypohalous acid in aqueous solutions includes at least a single liquid chamber for receiving an aqueous solution containing halide ions therein, the single liquid chamber having an exterior wall and a solid anode contained within to provide for the oxidation of the halide ions, which, in turn, provides for the formation of hypohalous acid in aqueous solution, and a gas permeable cathode forming a portion of the exterior wall of the single liquid chamber, the cathode providing for the reduction of oxygen to provide hydroxyl ions in solution within the single liquid chamber to mix with the products generated at the anode. An embodiment of the electrolytic device including an anolyte chamber and a catholyte chamber separated by an ionomeric membrane is also described, whereby the anolyte chamber further includes an outlet including a pH control for determining and regulating the pH of the exiting anolyte effluent to between about 4 and 9. The product is suitable for disinfectant applications including as a hand sanitizer.

Δ9 THC acid is obtained from plant material and extracted into an aqueous solvent under conditions of pH control. The acid is converted to a salt and the salt extracted into a polar solvent, yielding acid of high purity. The Δ9 THC acid is then converted to Δ9 THC which is further purified and combined with a carrier for pharmaceutical use.

In a slurry composition and a method of polishing a layer using the slurry composition, the slurry composition includes from about 3 to 20 percent by weight of an abrasive, from about 0.1 to 3 percent by weight of an ionic surfactant, from about 0.01 to 0.1 percent by weight of a nonionic surfactant, from about 0.01 to 1 percent by weight of a polish accelerating agent including an amino acid compound, and a remainder of an aqueous solution including a basic pH-controlling agent and water. The slurry composition including the nonionic surfactant and the polish accelerating agent may be used for speedily polishing a stepped upper portion of a silicon oxide layer, and may also enable a lower portion of the silicon oxide layer to function as a polish stop layer.

A method for treating subterranean formations by the use of delayed release pH control agents in subterranean formations during fracturing operations includes providing a fracturing fluid comprising a base fluid, a viscosifying agent, a pH sensitive crosslinking agent, and a delayed release pH-adjusting material. The delayed release pH-adjusting material includes a pH-adjusting agent and a binder. The fracturing fluid is introduced into a subterranean formation, and the pH of the fracturing fluid is changed through at least partial degradation or disassociation of the delayed release pH-adjusting material, thereby allowing the viscosifying agent to be crosslinked through activation of the pH sensitive crosslinking agent.

The present invention is directed to a homogeneous, thermoreversible gel comprising carrageenan wherein the carrageenan has a viscosity of less than 10 cP at 75° C. when measured in a 0.10 molar aqueous sodium chloride solution containing 1.5% by weight of the carrageenan based on the weight of all components in the solution, and optionally at least one of a plasticizer, a second film former, a bulking agent, and a pH controlling agent, wherein the gel has a solids content of at least 40%. The present invention is also directed to processes for the preparation thereof, as well as to variety of products containing the gel including edible products, soft capsules, hard capsules and solid forms encapsulating powders, tablets, caplets, etc.

Abstract of the Disclosure The present invention is directed to a homogeneous, thermoreversible gel film comprising a film forming amount of a water soluble, thermoreversible alginate, and optionally at least one of a plasticizer, a second film former, a bulking agent, and a pH controlling agent; and processes for the preparation thereof. The present invention is also directed to soft capsules and solid forms containing the gel film, as well as processes for the preparation thereof.

This invention relates to the biocatalysts for the efficient production of succinic acid and / or other products from renewable biological feedstocks. The biocatalysts have a very high efficiency for the growth-coupled production of succinic acid and / or other products from carbohydrate feed stocks as a result of both genetic manipulations and metabolic evolution. More specifically, certain biocatalysts of the present invention produce succinic acid at high titers and yield in mineral salts media during simple pH-controlled, batch fermentation without the addition of any exogenous genetic material. The genetic manipulations of the present invention are concerned with the energy-conserving strategies coupled with the elimination of alternative routes for NADH oxidation other than the routes for succinic acid production. The biocatalysts contain glucose-repressed gluconeogenic phosphoenol pyruvate carboxykinase (pck) depressed by genetic modifications and a genetically-inactivated phosphotransferase system. In terms of succinic acid production efficiency, the biocatalysts of the present invention are functionally equivalent to succinate producing rumen bacteria such as Actinobacillus succinogens and Mannheimia succiniproducens with one difference that the biocatalysts are able to achieve this high level of succinic acid production in a minimal salt medium with carbohydrate source as opposed to the requirement for a rich media for succinic acid production by rumen bacteria.

The invention relates to the control of pH in water where hydroxyl ions are being produced by adding to the water an amount of transition metal salt sufficient to bind with hydroxyl into a slightly soluble or insoluble reaction product, thereby removing sufficient hydroxyl ion from the water to lower the pH thereof. This technique is particularly suitable for pH control in pool or spa water that is sanitized using chemical or electrolytic chlorination, where the sanitation process causes the pH in the water to rise.

A process for hydraulic fracturing including the steps of (a) providing a fracturing fluid by combining water, proppant, an oxidizing biocide, and a friction reducer; (b) introducing the fracturing fluid into a well; and (c) controlling the pH of the fracturing fluid to a pH of at least about 4.5.

Integrated membrane treatment systems for treatment of an aqueous solution. In embodiments, components, such as an MBR, are integrated with means to recover energy from the system, for example from an RO concentrate, to operate the other components. In embodiments including biological treatment, RO is integrated with other components, such as an MBR with the ROs ability to remove inorganic nitrogen enabling biological treatment to be performed with only partial nitrification and the MBR operated without active pH control. In embodiments, RO is integrated with a chlorine generator to convert chlorides present in the RO concentrate for an in-situ source of oxidizing biocides for disinfection purposes. Chloramines may be generated in-situ from residual ammonia and chlorides in the RO reject. In embodiments, carrier media is employed in a membrane tank to enhance removal of residual organics by the MBR and to also improve effectiveness of membrane scouring.

A composition and method is given for a well control fluid that is injected into a well during completion or remediation and prevents fluid flow from a formation into the well during operations (such as shut-in, or placement or adjustment of tools / hardware) when no fluid flow is desired. The composition includes a viscoelastic surfactant fluid system (VES) and a decomposable first solid material, preferably in fiber form, that forms a pack or plug in the well at the location where fluid would otherwise leak off, and then decomposes without intervention to release a product that is a breaker for the surfactant or the micelles of the VES. The composition optionally also contains a pH control agent and a second solid (that may also be a fluid loss agent) that affect the decomposition of the first solid.

A complex coacervate delivery system is provided which encapsulates lipophilic nutrients such as, for example, fish oils high in omega-3 fatty acids. The complex coacervate delivery system protects the lipophilic nutrient from degradation, e.g., oxidation and hydrolysis, and also reduces or eliminates the unpleasant taste and odor of the lipophilic nutrient. The complex coacervate delivery system upon ingestion is operative to substantially release the lipophilic nutrient in the lower gastrointestinal tract in a pH-controlled manner. The complex coacervate delivery system may be included in a food or beverage product having a pH value within the range of about 1.5 to about 5.0.

The invention discloses textile inkjet printing acid dye ink comprising the following components in percentage by weight: 0.5-10 percent of acid dye, 0.5-10 percent of viscosity modifier, 5.0-20 percent of humectant, 0.2-5 percent of osmotic agent, 0.1-2 percent of pH control agent, 0.1-1 percent of disinfectant and the balance of deionized water. The invention also discloses a production method of the textile inkjet printing acid dye ink, comprising the following steps of: (1) mixing the acid dye, the viscosity modifier, the humectant, the osmotic agent, the pH control agent, the disinfectant and the deionized water for 2 hours in the rotation speed of 100-300 revolutions per second at the temperature of 40-60 DEG C; and (2) cooling the mixture to normal temperature and sequentially filtering the mixture by micropore filters with pore diameters of 0.45 micrometer and 0.20 micrometer. The textile inkjet printing acid dye ink can be used for the inkjet printing of true silk, wool, chinlon, leather, and the like.

This disclosure relates to a preparation method of a low-pH controlled-release intelligent corrosion inhibitor. The low-pH controlled-release intelligent corrosion inhibitor comprises a hydrogel with low pH responsiveness and a corrosion inhibiting substance having the capacity of corrosion inhibition. That is, a corrosion inhibiting substance is wrapped in a low-pH sensitive hydrogel. The swelling degree of the pH sensitive hydrogel may be changed according to the amounts of monomers and crosslinking agents so as to control the releasing speed of the corrosion inhibiting substance. By the soaking experiment and the measurements of electrochemical polarization curves and alternating impedance spectra, the sensitive and long-lasting features of the low-pH controlled-release intelligent corrosion inhibitor are indicated. Therefore, the advantageous effects of this disclosure lies in that: 1) the system enables the releasing speed of the corrosion inhibiting substance to be controlled by pH; 2) the system enables long-lasting effect and high corrosion inhibition efficiency of the corrosion inhibiting substance; and 3) the system has broad applicability.

The invention relates to a preparation method of high-gravity spherical cobalt carbonate, comprising the following steps of: with a water-soluble cobalt salt as a raw material and ammonium hydrogen carbonate as a precipitant adding a cobalt salt aqueous solution and an ammonium hydrogen carbonate aqueous solution into a reactor at the same time by adopting a first-slow and rear-quick stage feeding manner at reaction temperature of 60-90DEG C under a stirring condition, wherein a feeding speed ratio of the cobalt salt aqueous solution of a slow feeding stage to a quick feeding stage is 1:2.5-1:10, and the feeding volume of the slow feeding stage occupies 25-60 percent of the total feeding volume; controlling pH of a reaction solution between 7.0 and 7.5; then, reducing the temperature to carry out heat preservation reaction; and filtering, drying and washing a reaction product to obtain the high-gravity spherical cobalt carbonate. Under the condition of high temperature, a first-slow and rear-quick stage speed-control feeding manner is adopted to prepare cobalt carbonate which has the advantages of high spherical degree, high gravity, controllable grain diameter, good dispersive property and good flow property and can satisfy different product requirements; meanwhile, the invention has short reaction time and is beneficial to the increasing of the production efficiency.

The invention relates to an in vitro culture device, which can simulate intestinal flora for intestinal and continuous flow, comprising a temperature control system of a fermentation tank, an automatic fresh culture medium feeding and a waste liquid output system and a safeguard system for an environment required by the growth of the intestinal flora; the fermentation tank that is connected with a constant temperature water bath cauldron and a micro submersible and is provided with a water bath clamp ferrule is designed; the culture medium can continuously flow into while the waste liquid can continuously flow out the system through the connection of a peristaltic pump; an anaerobic environment, pH scope and nutrient conditions are reached by inputting nitrogen and a pH controller. The human intestinal flora culture device successfully constructed in the invention is characterized by low cost, easy use and simple operation. Besides, the human intestinal flora can grow stably upon inspection and the comparability of the structure of the intestinal flora is up to 80 percent or more compared with the intestinal flora before the culture. Therefore, the invention is applicable to the safety evaluation and research of the influence to the human intestinal flora caused by antibacterial residues, and the invention is also applicable to the function evaluation of nutrient substances and function and safety evaluation and research of medicines and foods.

The waterproof grease composition of the present application comprises a base oil that comprises at least one of mineral oil and synthetic oil and having a kinematic viscosity of from 10 to 400 mm2 / sec at 40° C., a thickener, and a waterproofness-imparting agent selected from surfactant, metal soap, fluorine-containing water repellent, silicone-type water repellent, pH-controlling agent, wax, polymer and graphite. Accordingly, it may prevent peeling such as white structure peeling even when water is mixed therein.The wheel-supporting roller bearing of the invention comprises an inner member having a raceway surface in the outer peripheral surface thereof, an outer member having, in the inner peripheral surface thereof, a raceway surface that faces the raceway surface of the inner member and disposed outside the inner member, and plural rolling elements rollably disposed between the two raceway surfaces, and which contains the above waterproof grease composition sealed therein; and this has excellent waterproofness.