Liquefying apparatus

Abstract

A conversion-to-oil apparatus is not provided with rotary members in a heating unit and in a decomposing unit in the process of changing plastic into oil, a residue tank and catalyst, wherein plastic gel is fed into a first buffer tank 2 including a cylinder disposed vertically, a second buffer tank 3 including a cylinder disposed vertically and finally a vaporizing vessel 4 including a cylinder 4 a disposed laterally, a liquid surface L·S in the vaporizing vessel 4 being adjusted at a diagonal center position in the vertical direction of the cylinder by controlling both the feeding amount of plastic gel and the temperature of the liquid surface so as to be a temperature of 400° C. to 410° C., so that the rotary members, the residue tank and the catalyst become unnecessary to make the structure of the apparatus compact.

1 . An apparatus for converting plastic into oil in which the plastic is heated to be melted so as to vaporize molten plastic in a process of thermal decomposition, which comprises:
 an extruder for extruding plastic gel produced by melting the plastic;   a buffer tank for staying the plastic gel therein extruded from the extruder at a predetermined temperature for a predetermined time; and   a vaporizing vessel for storing molten plastic fed from the buffer tank to vaporize the molten plastic so as to produce plastic gas from a liquid surface of the molten plastic, the vaporizing vessel having a large vaporizing area therein, the temperature of which is adjusted.   
     
     
         2 . An apparatus for converting plastic into oil according to  claim 1 , wherein the liquid surface is adjusted at a temperature of 400° C. to 410° C. 
     
     
         3 . An apparatus for converting plastic into oil according to  claim 1 ,
 wherein the buffer tank comprises two cylinders which are disposed at different height positions, respectively, the vaporizing vessel comprises a lateral-type of cylinder, and the buffer tank and the vaporizing vessel are heated by a plate-like heater for covering the outer circumferential walls thereof.   
     
     
         4 . An apparatus for converting plastic into oil according to  claim 1 ,
 wherein each of the buffer tank and vaporizing vessel has a closable/openable maintenance lid at its one end, respectively.   
     
     
         5 . An apparatus for converting plastic into oil according to  claim 1 ,
 wherein a feeding amount of molten plastic is so adjusted that the liquid surface of the molten plastic coincides with a diagonal center position of the cylinder in the vertical position.   
     
     
         6 . An apparatus for converting plastic into oil according to  claim 5 , wherein in case that the liquid surface of the molten plastic goes up above the diagonal center position of the cylinder in the vertical direction, a watt density of the plate-like heater for covering a circumferential wall of the vaporising vessel is increased, while in case that the liquid surface thereof goes down under the position, the watt density of the plate-like heater is decreased. 
     
     
         7 . An apparatus for converting plastic into oil according to  claim 6 ,
 wherein the watt density thereof is adjusted in a range of 0.6 w/cm 2  to 1.4 w/cm 2 .   
     
     
         8 . An apparatus for converting plastic into oil according to  claim 1 , wherein the apparatus has a condenser for liquefying the plastic gas produced in the vaporizing vessel, the condenser storing a predetermined amount of hydrocarbon oil. 
     
     
         9 . An apparatus for converting plastic into oil according to  claim 1 , wherein the apparatus has a condenser for liquefying the plastic gas in the vaporising vessel, the condenser storing neutralizer for neutralizing chlorine produced after vinyl chloride is treated. 
     
     
         10 . An apparatus for converting plastic into oil according to  claim 2 ,
 wherein each of the buffer tank and vaporizing vessel has a closable/openable maintenance lid at its one end, respectively.   
     
     
         11 . An apparatus for converting plastic into oil according to  claim 2 ,
 wherein a feeding amount of molten plastic is so adjusted that the liquid surface of the molten plastic coincides with a diagonal center position of the cylinder in the vertical position.   
     
     
         12 . An apparatus for converting plastic into oil according to  claim 3 ,
 wherein a feeding amount of molten plastic is so adjusted that the liquid surface of the molten plastic coincides with a diagonal center position of the cylinder in the vertical position.