CN107216908A

CN107216908A - A kind of used oil extraction tower pitch discharge technique

Info

Publication number: CN107216908A
Application number: CN201710603470.0A
Authority: CN
Inventors: 张家彬
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-07-23
Filing date: 2017-07-23
Publication date: 2017-09-29

Abstract

The purpose of the present invention is to utilize a kind of liquid（Hereinafter referred to as carrier）The carrier discharged as used oil extraction tower pitch, the carrier and extractant, pitch are all immiscible, and density ratio solvent is big, smaller than pitch.

Description

A kind of used oil extraction tower pitch discharge technique

Technical field

The present invention relates to a kind of used oil extraction tower pitch discharge technique.This method belongs to petrochemical industry and environmental protection skill Art field.

Background technology

Used oil belongs to hazardous waste, containing a large amount of carcinogens, and topple over to cause to seriously endanger to natural environment, burning The harmful substances such as a large amount of dioxin, sulphur phosphorus organic compound can be produced.Only have some hydrocarbon (about 10%~25%) to become in used oil Matter, remaining most of hydro carbons composition is still the main viscosity carrier of lubricating oil, is removed after rotten thing and impurity, you can regeneration symbol The lube base oil of quality requirement is closed, and regeneration rate can reach 70% or so.2012, China's lubricating oil real consumption amount reached 8500000 tons, calculated according to 20% proportion of goods damageds and 70% rate of recovery, every year at least recyclable 4,700,000 tons of used oil, renewable profit More than 330 ten thousand tons of lubricant base oil.

The regenerating waste oil industry of China starts development the sixties in last century, but backward in technique, with low quality.Last century In the later stage eighties, since regenerating waste oil industry starts fast development, particularly 2000 year, regenerating waste oil scope of the enterprise has very Big lifting, still, however it remains the problems such as manufacturing process is simple, pollution environment is serious.In consideration of it, national development and reform committee member It can have issued《Embodiment is comprehensively utilized on printing and distributing " 12 " comprehensive utilization of resources instruction and large solid waste Notify》, notification waste used oil is reclaimed and recycling is the key industry for encouraging development, from November 1st, 2013 extremely On October 31st, 2018, the industrial oils such as the lube base oil, gasoline, diesel oil that are produced by raw material of the used oil of recovery are exempted from Levy the consumption tax.Regenerating waste oil enterprise development is supported by preferential tax revenue, can both alleviate the pressure of China's oil resource scarcity, Regular distributors can be helped to spend hard time again, promote the sector industrialized development, improve the sector technical merit, Reduce environmental pollution.

Solvent extraction early has an application in used oil regeneration technology, common solvent have the lower carbon number hydrocarbons such as propane, butane or Their mixture, by additive, colloid, asphalitine, solid impurity in extraction removing used oil etc., these things of removing Matter is to be generally termed pitch in a kind of mixture of complicated component, industry.Existing process removes pitch by extraction tower, removing Pitch is from extraction tower bottom discharge, then by heating facility, enters solvent recovery stripper.This pitch is dripped with traditional oil Green grass or young crops has very big difference, and especially sticky and softening point is up to more than 200 DEG C, is very easy to block extraction tower bottom and it is discharged The pipeline and equipment passed through, moreover, the boundary position measurement between extraction tower bottom extractant and pitch is extremely difficult, to safe life Production and continuous production all bring very big threat and difficulty.

The content of the invention

The purpose of the present invention is to utilize a kind of liquid（Hereinafter referred to as carrier）The load discharged as used oil extraction tower pitch Body, the carrier and extractant, pitch are all immiscible, and density ratio solvent is big, smaller than pitch.

The content of the invention

Technical solution of the present invention：In extraction tower bottom, suitable boundary position is set up with carrier and fluid-tight is realized.Because used oil In bitumen content seldom, generally 3% ~ 8%（Weight）, therefore, these pitches are to be analysed with short grained form from extractant Go out.These little particle pitches are crashed into after carrier, can discharge its solvent carried under one's arms, and gradually sink to carrier, and carrier is wrapped up in again Hold the pitch discharge extraction tower of these fine granularities under the arm, extraction tower is recirculated back to after filtration facility removes deasphalting outside tower.

Advantages of the present invention：

Firstth, existing technique, the boundary position measurement between extraction tower bottom extractant and pitch is extremely difficult, and this process tower bottom Boundary position measurement between portion's extractant and pitch is simple accurately and reliably；

Second, existing technique can be blended into 50% ~ 70% easy flowing oil product into pitch, be blended into ensure the mobility of pitch Oil product be generally exactly used oil, and this technique, it is not necessary to be blended into any oil product, improve the extraction yield of used oil, reduce The yield of pitch；

3rd, existing technique can all set to ensure the mobility of pitch on the pipeline that extraction tower bottom and pitch are passed through Heat tracing facility is put, and this technique need not set heat tracing facility；

4th, the solvent that existing technique is carried under one's arms for removing pitch can all set asphaltene stripper, and this technique need not be set Put；

5th, existing technique asphaltic products is very easy to solidification in storage and transportation, and this technique asphaltic products is straight Normal temperature solid-state is connected in, is easy to store and transports.

Brief description of the drawings

Fig. 1 is process schematic representation of the invention.

In figure：A is that extraction tower, B are that filtration facility, C are pumps, 1 are carrier and pitch, 2 are pitch, 3 are carriers.

Embodiment

Carrier 3 sets up boundary position while entering extraction tower bottom formation fluid-tight, and pitch particle crashes into bottom of towe in extraction tower Carrier；Carrier and pitch 1 are discharged into filtration facility B from bottom of towe；Pitch 2 is discharged from filtration facility；Carrier 3 enters Pump C is circulated.

Embodiment one：

Carrier is the mixture of water and ethanol；

4.3 MPaG, normal temperature, 3t/h carrier 3, into extraction tower A bottoms, and form interface；

0.5t/h pitch particle crashes into carrier in extraction tower；

Carrier and pitch 1 are discharged from extraction tower A bottoms, into filtration facility B；

Pitch 2 is discharged from filtration facility B；

Carrier 3 is recycled back into extraction tower A into pump C.

Claims

1. a kind of used oil extraction tower pitch discharge technique, it is characterised in that：Utilize a kind of liquid（Hereinafter referred to as carrier）As The carrier of used oil extraction tower pitch discharge, the carrier and extractant, pitch is all immiscible, and density ratio solvent it is big, than drip It is blue or green small.

2. a kind of used oil extraction tower pitch discharge technique according to claim 1, it is characterised in that：Carrier be water, Methanol, ethanol either their mixture.