| Method for recycling rubber-containing wastes -> Monitor Keywords |
|
|
  Method for recycling rubber-containing wastesUSPTO Application #: 20060281956Title: Method for recycling rubber-containing wastes Abstract: The inventive method includes thermal liquefaction of wastes in an organic solvent at a temperature above 270° C. and a pressure up to 6 MPa. The liquid fraction is separated from the undissolved product. The liquid fraction is distilled into the fraction with the boiling temperature below 220° C. and the fraction with the boiling temperature above 220° C. Alkyl benzene or the gasoline fraction with a boiling temperature below 220° C. is used as an organic solvent at the start-up of the process. Thermal liquefaction of a batch of wastes is carried out in an organic solvent at a temperature from 280° C. to 435° C. and a pressure at least 2.9 MPa, the organic solvent-waste weight ratio being more than 1.0. The liquid fraction with the boiling temperature below 220° C. is subjected to catalytic reforming. A part of the liquid fraction, as subjected to catalytic reforming, with the boiling temperature below 220° C. is used as the target product, and the remaining part of the liquid fraction, as subjected to catalytic reforming, with the boiling temperature below 220° C. is used as a solvent and returned for thermal liquefaction of a new batch of wastes at a temperature from 280° C. to 435° C. and a pressure at least 2.9 MPa, the solvent-waste weight ratio being more than 1.0. The process of thermal liquefaction is continued in the said conditions of thermal liquefaction and catalytic reforming for the next and subsequent batches of wastes, while a part of the liquid fraction, as subjected to catalytic reforming, with the boiling temperature below 220° C. being returned for thermal liquefaction. (end of abstract) Agent: Patenttm.us - Portland, OR, US Inventor: Kirill Zyskovich Bochaver USPTO Applicaton #: 20060281956 - Class: 585241000 (USPTO) Related Patent Categories: Chemistry Of Hydrocarbon Compounds, Production Of Hydrocarbon Mixture From Refuse Or Vegetation, From Synthetic Resin Or Rubber The Patent Description & Claims data below is from USPTO Patent Application 20060281956. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] This invention relates to disposal in the chemical industry of organic industrial and household rubber wastes and their processing into motor fuel and chemical stock to be further used as a boiler fuel, a bituminous-like binder or stock for production thereof, technical carbon or stock for production thereof, for electric arc furnaces, electrolysis baths, carbon-carbonic materials (CCM) for metallurgy, etc, as well as a small quantity of hydrocarbon gas which may be used as a fuel. PRIOR ART [0002] The problem of chemical processing of various organic industrial and household polymeric wastes is very actual due to continuous increase in their quantities and pollution of the environment. [0003] Removal of this problem will enable to solve the ecological task of complex and harmless disposal of rubber-containing industrial and household wastes, expand the base of hydrocarbon stock produced from oil, coals, shale coals, natural bitumen. [0004] A method for recycling rubber-containing waste into motor fuel and chemical stock is known, which includes thermal liquefaction (thermolysis) of wastes in a hydrocarbon solvent at an elevated pressure (International Application WO 95/20007, C08J 11/20, published on 27 Jul. 1995). [0005] As the hydrocarbon solvent the said method uses wastes of the synthetic rubber production, which are taken with source rubber-containing waste in the weight ratio of 2-4:1, respectively, and the thermal liquefaction process is carried out at a temperature from 270 to 420.degree. C. and a pressure from 1 to 6 MPa. [0006] Furthermore, an embodiment of the method provides for partial return to the process the liquid fraction obtained after distillation, having the boiling temperature above 200.degree. C., as an additive to the initial hydrocarbon solvent in the weight ratio of 1-5:10, respectively, and the remaining part of the said fraction is separated as the target product. [0007] An advantage of the said method is its simplified technology and an increase in the yield of the light fractions having the boiling temperature under 200.degree. C. [0008] A limitation of the said method is the use of wastes from the synthetic rubber production, since such wastes are not always available in the required quantity. [0009] A method for recycling organic polymeric wastes is also known, which includes the thermal liquefaction of wastes at a temperature above 270.degree. C. and an elevated pressure in at least one solvent, namely alkyl benzene, the separation of the liquid fraction with its subsequent distillation (RF Patent No. 2167168, C08J 11/04, published on 20 May 2001). [0010] The said method uses, while thermally liquefying wastes, an elevated pressure not lower than 6.1 MPa, and, after being distilled, the liquid fraction with a boiling temperature at least 210.degree. C. is introduced as an additional component of the solvent in the weight ratio not less than 1:1 at thermally liquefying new wastes. [0011] In the embodiments of the method the solvent-waste weight ratio is selected in the range from 1:1 to 4.2:1. Moreover, after being distilled, the liquid fraction having the boiling temperature not less than 210.degree. C. is introduced as an additional component of the solvent in the weight ratio at least 5:1. [0012] An advantage of the said method is the use of alkyl benzene as an organic solvent. [0013] A limitation of the said method is its high energy intensity due to using, as a part of the solvent, the liquid fraction with the boiling temperature not less than 210.degree. C., and high operation pressures exceeding 6.1 MPa. [0014] The closest method is a method of processing organic polymeric wastes, including rubber-containing ones, comprising, when started up in a reactor, the thermal liquefaction of wastes in an organic solvent, namely alkyl benzene, at a temperature above 270.degree. C. and a pressure up to 6 MPa, the separation of the liquid fraction from the unsolved product, the distillation of the liquid fraction into a fraction having the boiling temperature below 220.degree. C. and a fraction having the boiling temperature above 220.degree. C. (RF Patent No. 2110535, C08J 11/04, published on 10 May 1998). [0015] According to the above method the thermal liquefaction of wastes is carried out at a temperature from 270.degree. C. to 420.degree. C. and at a pressure from 1 MPa to 6 MPa with the solvent-waste weight ratio 2-4:1, respectively, in the presence of a rare-earth metal or intermetallics based on rare-earth metals or in the presence of titanium hydride, which are taken in the amount of 0.5% to 10% of the reaction mixture weight, alkyl benzene, e.g., toluene, xylene, dimethyl-trimethyl-tetramethyl benzene or mixtures thereof, is used as the solvent, or the product of distilling "raw benzene" produced by high-temperature coking of black coals is used as the solvent, which enables to accelerate the process of processing wastes and increase the yield of liquid products, as well as the latter's content of fractions having the boiling temperature below 200.degree. C. Thus, the said method enables to increase the rate of conversion of rubber-containing and other organic wastes. [0016] Some limitations of the said method are: [0017] for efficient thermal liquefaction (thermolysis) the process is carried out in the presence of a rare-earth metal or intermetallics based on rare-earth metals or in the presence which are taken in the amount of 0.5% to 10% of the reaction mixture weight, which complicates the production process, and, moreover, removal of these additional catalysts and additives from the resulting valuable target product, namely, technical carbon, is very complicated; [0018] low quality of technical carbon due to big amounts of ash materials, which is a consequence of using additives together with a solvent; [0019] a high consumption rate of a solvent when producing a high-quality gasoline fraction. SUMMARY OF THE INVENTION [0020] This invention is based on the task of creating a method for recycling rubber-containing wastes, which would enable to accelerate the process and simplify the technology, improve the process productivity as to the yield of a high-octane gasoline fraction and to produce technical carbon as a commercial product, and, thus, lower the power intensity, expand the functional capabilities and raise the quality of the products while lowering the operating costs. [0021] In order to solve the stated task, while carrying out the said known method for recycling rubber-containing wastes, including thermal liquefaction of wastes fed into a reactor containing an organic solvent at a temperature above 270.degree. C. and a pressure up to 6 MPa, separation the liquid fraction from the undissolved product, distillation (in the process of thermal liquefaction) of the liquid fraction into the fraction with the boiling temperature below 220.degree. C. and the fraction with the boiling temperature above 220.degree. C., according to the invention, after feeding in a reactor a batch of wastes and an organic solvent, thermal liquefaction is carried out at a temperature of 280.degree. C. and a pressure at least 2.9 MPa, the organic solvent-waste weight ratio being more than 1.0, the liquid fraction with the boiling temperature below 220.degree. C. is subjected to catalytic reforming, a part of the liquid fraction, as subjected to catalytic reforming, with the boiling temperature below 220.degree. C. is used as the target product, and the remaining part of the liquid fraction, as subjected to catalytic reforming, with the boiling temperature below 220.degree. C. is used as a solvent and returned for thermal liquefaction of a new batch of wastes at a temperature of 280.degree. C. and a pressure at least 2.9 MPa, the solvent-waste weight ratio being more than 1.0, the liquid fraction, as obtained from the new batch of wastes, with the boiling temperature below 220.degree. C. is subjected to catalytic reforming, a part of the liquid fraction, as subjected to catalytic reforming, with the boiling temperature below 220.degree. C. is used as the target product, and the remaining part of the liquid fraction, as subjected to catalytic reforming, with the boiling temperature below 220.degree. C. is once again returned for thermal liquefaction of a new batch of wastes, the process is continued in the said conditions of thermal liquefaction and catalytic reforming for the next and subsequent batches of wastes, while a part of the liquid fraction, as subjected to catalytic reforming, with the boiling temperature below 220.degree. C. being returned for thermal liquefaction of subsequent batches of wastes. Continue reading... Full patent description for Method for recycling rubber-containing wastes Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Method for recycling rubber-containing wastes patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Method for recycling rubber-containing wastes or other areas of interest. ### Previous Patent Application: Fluorobutene derivatives and process for producing same Next Patent Application: Dual functional catalyst for selective opening of cyclic paraffins and process for using the catalyst Industry Class: Chemistry of hydrocarbon compounds ### FreshPatents.com Support Thank you for viewing the Method for recycling rubber-containing wastes patent info. IP-related news and info Results in 0.38291 seconds Other interesting Feshpatents.com categories: Canon USA , Celera Genomics , Cephalon, Inc. , Cingular Wireless , Clorox , Colgate-Palmolive , Corning , Cymer , |
||
