DE10058162A1 - Carbonization of scrap rubber products for recovery of oil, metal and carbon granules involves drying, heating in reactor and removing oil before cooling and separating recyclable materials - Google Patents

Abstract

Carbonization of scrap rubber products for recovery of oil, metal and carbon granules involves drying, heating in reactor and removing oil before cooling and separating recyclable materials. Tires or vehicle chain drive units coated in or bonded to rubber are preheated to 30 deg C in a drying chamber and then loaded into a reactor. The reactor is heated to 450 deg C over 60 minutes and held at this temperature for 2.5 hours. Gas from carbonization flows upwards out of the reactor through a sealed pipe system and is cooled to 20-25 deg C. After separation of the cooling system and reactor the latter is moved back to the drying chamber where it remains until the outer wall has cooled to 25-30 deg C and material separation is possible.

Description

The invention relates to a method for charring of waste rubber products such as car tires and the like in a reactor.

From a published final report of the University of Applied Sciences Wiesbaden from May 1994 on the project "Thermal waste tire recycling" it is known whole old tires in a smoldering shaft for extraction of energy, oil and so-called tire coke environmentally friendly to process.

Essentially, the blurring occurs with Temperatures between 800 ° C to 900 ° C.

The product distribution achieved was as follows specified.

Approximately 60% carbonization gases (e.g. methane) and condensates (e.g. BTX fractions) and 40% solid residues, with 5% on the tire type used Steel wire insert and tire coke accounts for approx. 35%, 80% of which consists of activatable carbon. It was found that following the smoldering the tire coke separates extremely easily from the steel leaves. This results in granules different grain sizes.

In the VDI-Nachrichten, Düsseldorf, January 14, 2000  presented a new pyrolysis process, which in a company from Eisenhüttenstadt comes. The pyrolysis is carried out by a process control in a separate reactor under liquid tin a temperature of 500 ° C.

The low reaction temperature guarantees that none Pollutants are generated and the quality of the Recycling products without a material cycle Restrictions allowed. The shredded old tires are in the reactor via a lock system transported. The thermal decomposition takes place there of the starting material in the absence of oxygen.

The residence time of the old tires in the reactor is in Depending on the volume of rubber 12 minutes. The one running in the tin-metal bath Pyrolysis of the rubber ensures that emerging oxygen immediately on the surface of the Tin bath is bound as tin oxide and thus the does not interfere with chemical degradation reactions.

The rubber material is in gaseous and liquid Disassembled components.

The pyrolysis products rise from the metal bath and are separated into oil and gas via a cooling system. The gas is then used for energy supply of the reactor.

A mixture remains as solid reaction products Soot, filler, steel scrap and fabric left over.

This mixture is removed from the Reactor discharged and in a degassing system freed from oil residues.  

The stainless steel parts are separated by a magnetic separator fished. The are in a tumbler screening machine. Separated textile components. After that, the soot ground and bottled. The soot is the most valuable Product. After grinding, it can be used in the rubber industry be used again.

The disadvantage of the described prior art is that in the process of University of Applied Sciences Wiesbaden a significant proportion of Smoldering gas is produced and only 40% solid Residues remain.

In this known method, the granulate is also used grinded and burned as dust coke.

A calorific value is given here at 8 kWh / kg. It also states that you can Granules as a raw material for the production of technical activated carbon can use.

The Eisenhüttenstadt process has the disadvantage that the old tires have to be shredded. Furthermore, the use of liquid tin is additional required. In addition, the rubber material primarily in gaseous and liquid components disassembled.

The gas is used for energy supply. Furthermore, the mixture of soot. Filler, Steel scrap and fabric additionally over one Lock system ejected and in one Degassing system to be freed of oil residues. There is also a magnetic separator for the stainless steel parts  required, as well as a tumbler screen to the Discard textile components.

Furthermore, only the way is shown that the soot grinds and returns to the rubber industry.

So far it is with the known prior art was not possible, coated with rubber or equipped chains of all kinds of tracked vehicles to dispose of in an environmentally friendly manner and also for used rubber tires of all kinds, it was previously not possible to use the metal parts separate undamaged from the rubber and one again to use.

The object of the present invention is a Process for smoldering waste rubber products create, which allows, not just car tires or the like. But also coated with rubber or equipped chains of all kinds of tracked vehicles, such as B. tank chains, crawler excavator chains from Agricultural machinery etc. an environmentally friendly disposal and undamaged the metal parts from the rubber separate and recycle.

Furthermore, the inventive method Smoldering gas completely converted into oil and at produced granulate a higher quality and thus a wider range of uses can be achieved.

According to the invention the object is achieved in that waste rubber products, such as car tires, with rubber  coated or equipped chain links or whole chains to approx. 30 ° C in a drying room preheated and then placed in a reactor be placed in a warming up device Warmed up to approx. 450 ° C for 60 minutes and approx. 2.5 hours is kept at this temperature, which in the Smoldering gas evolving via a dense and mountable piping system upwards out of the reactor flows through a cooling device to room temperature cooled from approx. 20 ° C-25 ° C and then the Reactor after separation from the cooling device from the Warming device transported and into the drying room is spent in which the waste rubber products are stored and there the reactor remains closed until until it has an outside wall temperature of 25 ° C-30 ° C has reached.

The advantage of the invention is that once the resulting carbonization gas is completely converted into oil becomes.

Another advantage is that the granules and the Metal parts separated easily can be with the help of magnets and especially the Metal parts completely preserved and one Can be reused.

This is particularly the case with the chains from Tracked vehicles, e.g. B. of tank chains of large Meaning since the chains are reassembled and can be coated with rubber.  

In addition, the granules are higher Quality than before. These granules are made practically made of pure carbon and is therefore more versatile.

The operation of the invention is as follows. The aforementioned waste rubber products are dirt cleaned and in drying rooms at approx. 25 ° C-30 ° C heated. After that, they are placed in appropriate reactors inserted, stacked etc. The respective reactor is tightly sealed and has a tubular fitting at the top. The reactor filled with waste rubber products expediently via rail connection Warming device transported and the Warming device introduced. The tubular The mounting neck protrudes from the heating device and is tightly connected to the cooling device. The reactor is in the heating device during heated to approx. 450 ° C. over a period of approx. 60 minutes. This temperature of approx. 450 ° C remains with Reactor filled with waste rubber products about 2.5 hours exposed. The smoldering gas is over the cooling device is completely converted into oil, which is passed into appropriate collecting containers. Then the reactor is separated from the cooling system and in spent the drying room in which the waste rubber products store and heat them. If the reactor is one Wall temperature of 25 ° C-30 ° C, it will opened and the metal parts are magnetized  removed and the granulate is made accordingly further processed to pure carbon.

The oil obtained is also another Recycling fed

Claims (1)

Process for the smoldering of waste rubber products, such as car tires and the like, characterized in that the waste rubber products, such as car tires, chain links coated or equipped with rubber or entire chains are preheated to about 30 ° C. in a drying room and then introduced into a reactor, which is set in a heating device, heated to approx. 450 ° C in 60 minutes and held at this temperature for approx. 2.5 hours, with the carbonization gas arising in the reactor going upwards out of the reactor through a sealed and mountable pipe system Cooling device flows, cooled to room temperature of approx. 20 ° C-25 ° C and then the reactor, after being separated from the cooling device, is transported out of the heating device and brought into the drying room in which the waste rubber products are stored and the reactor remains closed there for so long. until it has reached an outside wall temperature of 25 ° C-30 ° C.