5,352,368 discloses an aldehyde treatment system in which the ldehyde is reacted with resorcinol and a polyimine to form a liquid product. The use of formaldehyde for medical and industrial applications is extensive. This invention relates to the neutralization of hazardous formaldehyde solutions to reduce the risk of direct and airborne contact by the use of chemically treated dried materials. U.S. Pat. The formaldehyde−sulfite reaction is an example of an “acid-to-alkali” clock. The invention comprises a matrix or medium upon which a mixture of urea, acid, calcium chloride and water is applied and dried. No. Acidic medium would be needed to mineralize HCHO to CO2.
210/633, 210/634, 210/702, 210/723, 210/729, 210/730, 210/731, 210/733, 210/734, 210/735, 210/749, 527/300, 527/305, 588/409, 588/215, 588/218, 588/238, 588/242, 588/205, 210/728, 210/749, 210/702, 210/723, 210/633, 210/634, 210/729, 210/730, 210/731, 210/733, 210/734, 210/735, 527/305, 527/300, 528/243, 528/246, 528/230, 528/232, Click for automatic bibliography No. This facilitates a rapid method for a technician working with formaldehyde to change a hazardous formaldehyde solution or vapor to a nonhazardous material. Consider the reaction between hydrochloric acid and sodium hydroxide; HCl (aq) + NaOH (aq)---> To write the products we combine the anion of the acid with the cation of the base and write the correct formula following the principle of electroneutrality. Solidification and vapor mitigation of aldehyde spills. The reaction product is also in suspension, rather than solid, which aids in disposal of the waste product. The present invention comprises a mixture of 20 to 50 percent urea, 3 to 7 percent acid, 1 to 10 percent calcium chloride and a quantity sufficient percent water. A treatment composition according to the instant invention comprising 48% urea, 12% polyethylenimine and 2.5% hydrochloric acid (37% concentrated HCl) was added to a 3.75% formaldehyde solution in a ratio of 1 part treatment composition to 5 parts formaldehyde bearing solution. The urea, acid and calcium chloride are dissolved into the water and then applied to a matrix or medium such as a cellulose fiber material. The present invention may be understood more readily by reference to the following detailed description of preferred embodiments of the invention. However, in practical use this reaction is slow, typically taking hours to completely neutralize the formaldehyde solution, including it's vapor-generating capabilities. The present invention alleviates to a great extent the disadvantages of known methods of neutralizing formaldehyde solutions and formaldehyde vapors by providing a rapid reaction formula that can be practically used for contact directly with formaldehyde in solution or with formaldehyde vapors that exist in the air. Privacy Policy Concerns for worker exposure and the environment have initiated the development of new handling, storage, and disposal regulations to limit worker and public exposure. 5,554,718 (1996) to Flory, et al. e) To provide a method of rapidly neutralizing formaldehyde solutions in which the neutralizing solution is comprised of 20 to 50 percent urea, 3 to 7 percent acid, 1 to 10 percent calcium chloride and a quantity sufficient percent water. Neutralization. HA + BOH ----> AB + HOH acid + base (reactants) ----> salt + water (products) ... **H⁺ ions and OH⁻ ions ATTRACT each other and form WATER very important to embalmers; ammonia neutralizes formaldehyde formaldehyde + ammonia yields urotropin + water. No. U.S. Pat. As a result during the dehydration stage phenol and formalin are distilled from the wastewater. 2 Reaction Order and Rate Constant The rate of reaction between the formaldehyde and the HSO ... neutralization by CO2 absorbed from the atmosphere.) As concern for worker and environmental exposure increases, various methods, techniques and products have been sought to reduce the risk of exposure to formaldehyde. It will be apparent to those skilled in the art that various modification and variations can be made in the present invention without departing form the scope or spirit of the invention. U.S. Pat. HCHO will be oxidized to formic acid and then to CO2. Accordingly, there is a need for a device and method to quickly neutralize formaldehyde not only for waste disposal, but to provide the practical applications of controlling a formaldehyde spill and restricting formaldehyde vapor. The reaction will take 15 - 60 minutes depending on how stressing the reaction conditions are. Thus, it is seen that a formulation and method for rapidly neutralizing formaldehyde solutions and vapor are provided. These disadvantages, along with the increasing awareness of reducing formaldehyde vapor and contact exposure to the laboratory technician, increases the need for an improved method or technology for reducing this risk. a) To provide a method of rapidly neutralizing formaldehyde solutions and vapor which can be used in the application of direct contact with formaldehyde solutions. Formaldehyde, also referred to as "formalin" is sold to these institutions in a concentrated form (37 to 50% formaldehyde, 6 to 15% alcohol stabilizer, and water) and, in dilution, the most common concentration being 10% formalin or 3.75% formaldehyde. These and further object will be more readily appreciated when considering the following disclosure and appended claims. In the case of exposure to formaldehyde vapor to the medium from the air, the hydroscopic nature of the dried medium along with the calcium chloride pulls the formaldehyde vapor from the air, reacting with the formaldehyde molecules and rapidly neutralizing them by the action of a polymerization process quickened by the calcium chloride. However, the risk can be easily managed if the flow is small and HCHO concentrations are low - i.e., for a 3,500 mg/L HCHO stream, the level of hydrogen that would be generated would be 117 mg/L. In the following paragraphs, the present invention will be described in detail. d) To provide a method of rapidly neutralizing formaldehyde solutions where calcium chloride is used to enhance the hydroscopic nature of the solution that is applied to a matrix or medium and then dried, adding to the vapor absorbing ability of the final absorbent material. As is clear from the results shown in Tables I and II, the treatment composition of the instant invention removes formaldehyde from the treated solution at a substantially higher rate, and requires a substantially smaller amount of treatment solution. It is contemplated that the formaldehyde be irreversibly reacted with a polyethylenimine, for example LUPASOL SC-86X, manufactured by BASF, in the presence of urea and an acid having a pH of less than 6 to form a reaction product in suspension which may be easily disposed.
In a preferred embodiment, the polyethylenimine comprises 0.5 to 15% by weight of the treatment composition, and the urea comprises 48% or less by weight of the treatment solution. 7. U.S. Pat. U.S. Pat. In one embodiment, the acid used is a mineral acid.
Commonly used in the health care industry to preserve biological samples for pathological analysis, formaldehyde solutions remain the common fixative of choice. No. 4,757,108 (1988) to Walisser. The reaction will take 10 - 180 minutes depending on reaction temperature, pH, and H2O2 charge. No. Complete conversion to CO2 is favored by strongly acidic media (< pH 2 - 3), elevated temperatures (40 - 60 deg-C), the presence of Fe2+ ions (25 - 100 mg/L, known as Fenton's Reagent), and an increased H2O2 dose. 3,689,463 (1972) to Krugilkov, et al. The present invention provides compositions and methods to convert a toxic composition containing formaldehyde to a non-toxic composition by way of a substantially irreversible reaction with a composition of the invention. Throughout this application, where publication are references, the disclosures of these publication in their entireties are hereby incorporated by reference into this application in order to more fully describe the state of the art to which this invention pertains.
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