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Method and apparatus for reclaiming oil from waste plastic

PCT No. PCT/JP97/00572 Sec. 371 Date Jan. 8, 1998 Sec. 102(e) Date Jan. 8, 1998 PCT Filed Feb. 27, 1997 PCT Pub. No. WO97/31990 PCT Pub. Date Sep. 4, 1997This invention provides a method for reclaiming oil from waste plastic in such a way that thermosetting resins and solid foreign matter in the plastic will not pose a problem. This method greatly reduces the burden of presorting the garbage or industrial waste. To achieve this objective when oil is to be reclaimed from a waste plastic containing chlorine compounds, such as vinyl chloride, the plastic must first be stripped of chlorine. Prior to pyrolysis, while being conveyed forward in a continuous stream, the plastic is mixed with heated sand and/or an additive agent to raise its temperature to 250-350 DEG C. This creates a product which is comprised of a mixture of sand and substantially dechlorinated plastic. The product is mixed with heated sand to heat it directly to a temperature of 350-500 DEG C. It is maintained at this temperature until pyrolysis occurs. In order to obtain high-quality oil with a low boiling point, a first gas/liquid separation process separates the product obtained from the aforesaid pyrolysis into liquid high-boiling point oil, gaseous low-boiling point oil and low molecular-weight gases, and recirculates the liquid high-boiling point oil to the pyrolysis process, and a second gas/liquid separation process separates the gaseous low-boiling point oil and low molecular-weight gases into liquid low-boiling point oil and low molecular-weight gases. The first and second gas/liquid separation process are connected in sequence.
Owner:MITSUBISHI HEAVY IND LTD

Ectopic leaching restoring device and restoring method for chromic slag polluted soil

The invention relates to an ectopic leaching restoring device and a restoring method for chromic slag polluted soil. The device is provided with an integrated soil leaching and dewatering system and mainly comprises a feeding system, a soil leaching-dewatering system, a waste gas treating system, an elution collecting treating system and an automatics control system. The chromic slag polluted soil firstly enters a reaction tank leaching section through the feeding system; a chrome-containing component in the soil is transferred into a liquid phase of a leaching agent; the liquid phase is rotated following a spiral stirring thruster; a muddy water mixture is conveyed into a reaction tank dewatering section; the filtrate is discharged through a tank wall with a water-permeable filtering function; the remained soil is conveyed to a mud discharging device following the rotating of the spiral stirring thruster; and lastly, the soil after being leached and dewatered is discharged. The device provided by the invention has the advantages that a power source is utilized to realize the soil leaching and muddy water separating, the energy consumption is low, the structure is simple, the use is convenient, the treating efficiency is high, and the purified degree of the polluted soil after being treated by using the device is above 85%.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI

Technological process of ramie bast fiber

The invention relates to a technological process of a ramie bast fiber, which comprises a basic degummed ramie production route: raw ramie skin-sorting and derooting-mechanical ungluing-cage loading-biological ungluing-high-temperature rinsing-cage unloading-sub-fiber washing-soft rinsing-radio frequency drying- degummed ramie. Long ramie can be growth through the mechanical hemp oiling- infiltration and health care-stretch breaking and carding-pre-gilling-combing and sorting-final gilling of the degummed ramie. Short ramie can be produced through the combing and the sorting of combed noil. Oakum can be produced through biological ungluing-high-temperature stewing and ungluing-high-temperature rinsing-cage unloading-sub-fiber washing-soft rinsing-dehydration and drying-radio frequency drying-mechanical hemp oiling- infiltration and health care-opening and edulcoration- combing and sorting. Improving methods are adopted for the mechanical ungluing, biological ungluing, high-temperature rinsing, sub-fiber washing, stretch breaking and carding, combing and sorting and the like. The preparation process has the advantages of short process, high production efficiency, high mechanical automation degree, stable product quality, excellent fiber quality and strong operability of fiber length and fineness, and can be used in the production processes of various bast fiber raw material, gramineae fiber raw material, leaf fiber raw material and other fibers.
Owner:THE QUARTERMASTER RES INST OF THE GENERAL LOGISTICS DEPT OF THE CPLA +2
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