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Method for disposing BDO (1,4-butanediol) waste liquid by recycling

A technology of recycling and waste liquid, applied in chemical instruments and methods, natural water treatment, water/sewage treatment, etc., can solve the problem that the waste liquid of BDO process cannot be recycled, and achieve resource regeneration, strong operability, Energy saving effect

Active Publication Date: 2018-05-11
LUOYANG HAOHAI IND & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention mainly aims at the problem that the existing BDO process waste liquid cannot be recycled, reduced and regenerated, especially for the BDO process waste liquid with high salt content, and provides an effective resource utilization method to realize the BDO waste Liquid large-scale, batch production, recycling of waste resources, increase product added value, reduce environmental pollution

Method used

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  • Method for disposing BDO (1,4-butanediol) waste liquid by recycling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Taking the BDO process waste liquid of a factory as an example, the basic composition of the process waste liquid is 5% low-boiling alcohol, 40% high-boiling alcohol, 40% salt, 5% water, and 10% other. The process of disposal is as follows:

[0024] 1. Pump the BDO process waste liquid to the pretreatment tank, separate and remove a small amount of low boiling matter and water, use vacuum distillation, adopt a vacuum degree of 50KPa, control the temperature at the top of the tower at 90°C, and remove low boiling matter and water. After condensation, it enters the intermediate storage tank for centralized collection and treatment, and the waste liquid at the bottom of the distillation tower enters the subsequent cracking device for treatment.

[0025] 2. Send the low boiling matter and water from the intermediate storage tank in step 1 to the rectification tower, raise the temperature to 170°C, and control the reflux ratio to 1.5:1. The high-purity low boiling matter sepa...

Embodiment 2

[0030] A method for resourceful disposal of BDO waste liquid. The BDO waste liquid is composed of the following raw materials in weight percentage: 18% low-boiling point alcohol, 22% high-boiling point alcohol, 15% salt, 20% water, and 25% other. The steps are as follows:

[0031] (1) Put the BDO waste liquid into the distillation tower for vacuum distillation, the vacuum degree is 20 kPa, the temperature at the top of the distillation tower is 60°C, and the low boilers, water and waste liquid at the bottom of the tower are separated;

[0032] (2) Send the low-boiling substances (methanol, ethanol, propanol and butanol) and water separated in step (1) into the rectification tower, raise the temperature to 70°C, and the reflux ratio is 1:1 to separate high-purity low-boiling substances thing;

[0033] (3) Send the waste liquid at the bottom of the tower obtained in step (1) to the thermal desorption rotary kiln. The temperature is controlled at 200°C. Natural gas is used as the...

Embodiment 3

[0036] A method for resourceful disposal of BDO waste liquid. The BDO waste liquid is composed of the following raw materials in weight percentage: 10% low-boiling point alcohol, 15% high-boiling point alcohol, 35% salt, 10% water, and 30% other products. The steps are as follows :

[0037] (1) Put the BDO waste liquid into the distillation tower for vacuum distillation, the vacuum degree is 100 kPa, the temperature at the top of the distillation tower is 80°C, and the low boilers, water and waste liquid at the bottom of the tower are separated;

[0038] (2) Send the low-boiling substances (methanol, ethanol, propanol and butanol) and water separated in step (1) into the rectification tower, raise the temperature to 90°C, and the reflux ratio is 6:1 to separate high-purity low-boiling thing;

[0039] (3) Send the tower bottom waste liquid obtained in step (1) to the thermal desorption rotary kiln. The temperature is controlled at 350°C. Natural gas is used as the heat source ...

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Abstract

The invention provides a method for disposing BDO (1,4-butanediol) waste liquid by recycling. The method comprises the steps of (1) putting the BDO waste liquid into a distillation column, conductingvacuum distillation, separating low-boiling-point substances and water, and bottom waste liquid; (2) putting the low-boiling-point substances and water separated in step (1) to the distillation columnto separate high-purity and low-boiling-point substances; (3) sending the bottom waste liquid obtained in step (1) to a thermal desorption rotary kiln, and after condensing gas phase components, andobtaining high calorific fuel oil blend oil and residue. The method for disposing the BDO waste liquid by recycling solves problems of high salt content of the BDO waste liquid and being unfavorable to distillation, and the method for disposing the BDO waste liquid by recycling has a simple process flow, strong operability, energy saving, ability to recover part of components, not only realizes resource regeneration, but also greatly reduces operating cost of hazardous waste incineration companies. The amount of waste slag produced after treatment is reduced, leachate precipitation during landfill and other treatment processes is reduced, a risk of secondary environmental pollution is avoided, and disposal of waste slag and subsequent disposal costs of an enterprise are reduced.

Description

technical field [0001] The invention relates to the field of BDO waste liquid treatment, in particular to a method for recycling BDO waste liquid. Background technique [0002] BDO, full name 1,4-butanediol, is an important fine chemical raw material. The existing BDO production processes mainly include Reppe method, maleic anhydride method, butadiene method and propylene oxide method. Regardless of the process route, in order to ensure the purity of the BDO product, a part of the waste liquid at the bottom of the tower needs to be discharged regularly during the preparation process. The normal production of 1 ton of BDO finished product requires about 100kg of process waste liquid. With the rapid growth of my country's BDO production scale in recent years, how to treat and dispose of BDO waste liquid on a large scale has become a key factor restricting BDO production enterprises. [0003] However, the current BDO production process does not have a reasonable solution to d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C02F103/36
CPCC02F1/046C02F2103/36
Inventor 剧长生徐品王红霞刘晓惠康延召
Owner LUOYANG HAOHAI IND & TRADE
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