WO2013091566A1 - 磷酸法活性炭炭化、活化反应回收的尾气磷酸的利用方法 - Google Patents

磷酸法活性炭炭化、活化反应回收的尾气磷酸的利用方法 Download PDF

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WO2013091566A1
WO2013091566A1 PCT/CN2012/087103 CN2012087103W WO2013091566A1 WO 2013091566 A1 WO2013091566 A1 WO 2013091566A1 CN 2012087103 W CN2012087103 W CN 2012087103W WO 2013091566 A1 WO2013091566 A1 WO 2013091566A1
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phosphoric acid
activated carbon
raw material
exhaust gas
active carbon
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PCT/CN2012/087103
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English (en)
French (fr)
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卢元健
缪存标
占礼万
方世国
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福建元力活性炭股份有限公司
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Publication of WO2013091566A1 publication Critical patent/WO2013091566A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/30—Active carbon
    • C01B32/312—Preparation
    • C01B32/336—Preparation characterised by gaseous activating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81—Solid phase processes

Definitions

  • the invention belongs to the field of recovering tail gas, and more particularly relates to a method for utilizing tail gas phosphoric acid which is carbonized by phosphoric acid activated carbon and recovered by activation reaction.
  • Activated carbon is widely used in the fields of petroleum and petrochemical, environmental protection, food and beverage, medicine purification and purification, water treatment and gas purification with its unique strong adsorption function.
  • the production process of activated carbon can be divided into chemical method and physical method.
  • the domestic chemical method phosphoric acid method
  • the domestic chemical method has a problem of high consumption of phosphoric acid, high energy consumption, serious smoke pollution, low degree of mechanization, and high labor intensity.
  • most of the tail gas produced by the active carbonization and activation process of the phosphoric acid method is sprayed to recover the tail gas phosphoric acid.
  • the acid concentration in the recycled liquid is low, the recovery effect is remarkable, and when the acid concentration in the recycled liquid is high, the recovery effect is poor.
  • the acid concentration of the recovered liquid must be controlled to a low level, and the recovered liquid is large in volume, resulting in high evaporation energy consumption, high operating cost and high operating strength.
  • the tail gas phosphoric acid is recovered by electric defogging. Although the volume of the recovered liquid is reduced, the electric energy consumption is large and the equipment technical requirements are high, so that the recovery and utilization of the activated carbon tail gas phosphoric acid is limited.
  • the object of the present invention is to provide a method for utilizing carbon black acid activated carbon activated carbon and activated and recovered tail gas phosphoric acid, which realizes high efficiency and low cost of tail gas phosphoric acid recovery, has remarkable economic benefits, and is widely applicable.
  • the reaction tail gas containing phosphoric acid is recovered, uniformly mixed with the activated carbon raw material, dried, and the phosphoric acid in the tail gas liquid is adsorbed on the activated carbon raw material, and the dried mixture is used as a raw material for preparing phosphoric acid activated carbon.
  • the mass concentration of phosphoric acid in the exhaust gas is 5% to 30%.
  • the activated carbon raw material has a moisture content of 1% to 30%.
  • 5 ⁇ 1 ⁇ 5 1. The ratio of the ratio of the mass ratio of 0. 5 ⁇ 2. 5: 1.
  • the drying temperature is 120 to 600 °C.
  • the dried mixture has a moisture content of 5% to 30%.
  • the porosity of raw materials (such as wood chips) for preparing activated carbon is used, and the activated carbon raw material is used as a carrier for recovering low-concentration acid to carry out phosphoric acid adsorption, thereby solving the problem that the tail gas liquid is difficult to be filtered.
  • the raw material for producing activated carbon is used as an adsorption carrier, which is easy to obtain, has low production cost, and has significant economic benefits.
  • the mass concentration of phosphoric acid in the tail gas is controlled at 5 to 30%.
  • the mass ratio of the exhaust gas to the porous activated carbon raw material is 0.5 to 2.5: 5: 1, mixing and stirring.
  • Drying section The drying temperature is 120 to 600 ° C, and the dried mixture has a moisture content of 5% to 30%.
  • the remaining steps of the production process using this tail gas phosphoric acid recovery are carried out in accordance with conventional prior art techniques.
  • the invention is further illustrated by the following examples of the invention, but the embodiments of the invention are not limited thereto.
  • the tail gas containing 5% (percentage means mass ratio) of phosphoric acid and the wood chips having a water content of 30% are mixed at a mass ratio of 2:1, and the moisture content of the wood chips is 5% after drying with a hot air of 550 ° C, and the wood chips are dried.
  • the phosphoric acid content is 15%.
  • the dried wood chips are mixed with a phosphoric acid solution as a raw material of phosphoric acid activated carbon in a certain ratio to produce phosphoric acid activated carbon.
  • the tail gas containing 15% (percentage by mass) of phosphoric acid and 1% of wood chips are mixed at a mass ratio of 1:1, and the moisture content of the wood chips is 30% after drying with a hot air of 150 ° C, and the wood chips are dried.
  • the phosphoric acid content was 13%.
  • the dried wood chips are mixed with a phosphoric acid solution as a raw material of phosphoric acid activated carbon in a certain ratio to produce phosphoric acid activated carbon.
  • the tail gas containing 30% (percentage by mass) of phosphoric acid and the wood slag containing 5% by mass are mixed at a mass ratio of 2.5:1, and the moisture content of the wood chips is 15% after drying by a 30CTC hot air stream, and the wood chips are dried.
  • the phosphoric acid content was 27%.
  • the dried wood chips are mixed with a phosphoric acid solution as a raw material of phosphoric acid activated carbon in a certain ratio to produce phosphoric acid activated carbon.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Inorganic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

提供一种磷酸法活性炭炭化、活化反应尾气回收磷酸的方法，其特征在于：收集含磷酸的尾气液，与活性炭原材料混合均匀，经干燥，使含磷酸的尾气液吸附在活性炭原材料上，作为制备磷酸法活性炭的原料。该方法实现尾气磷酸回收的高效和低成本化，具有显著的经济效益。

Description

磷酸法活性炭炭化、 活化反应回收的尾气磷酸的利用方法 技术领域
本发明属于回收尾气酸领域， 更具体涉及一种磷酸法活性炭炭化、活化反应 回收的尾气磷酸的利用方法。
背景技术
活性炭以其特有的强大吸附功能广泛应用于石油石化、环境保护、食品饮料、 医药的净化与提纯以及水处理和气体净化等领域。活性炭的生产工艺可分为化学 法和物理法两种。 目前国内化学法 （磷酸法） 活性炭生产普遍存在磷酸消耗大、 能耗高、烟气污染严重和机械化程度低、人员劳动强度大等问题。 目前磷酸法活 性炭炭化、活化工艺产生的尾气大部分采用喷淋方式回收尾气磷酸。循环的回收 液中酸浓度低时回收效果显著，循环的回收液中酸浓度高时回收效果差。 由于回 收液中炭粉、木焦油含量高导致过滤困难、蒸发浓縮困难。 为使尾气磷酸回收完 全， 回收液酸浓度必须控制较低、 产生的回收液体积大， 导致蒸发能耗高， 运行 费用高且操作强度大。个别企业通过回收液循环使用提高浓度后， 采用电除雾方 式回收尾气磷酸， 虽然减少了回收液体积， 但电能消耗大， 装备技术要求高， 使 活性炭尾气磷酸回收利用受到一定的限制。
发明内容
本发明的目的在于提供一种磷酸法活性炭炭化、活化回收的尾气磷酸的利用 方法， 实现尾气磷酸回收的高效和低成本化， 具有显著的经济效益， 并且， 适用 面广。
本发明的技术方案如下：
将含磷酸的反应尾气液回收， 与活性炭原材料混合均匀， 经干燥， 使尾气液 中的磷酸吸附在活性炭原材料上， 干燥后的混合物作为制备磷酸法活性炭的原 料。
所述尾气液中磷酸的质量浓度为 5%〜30%。
所述活性炭原材料的水分含量为 1%〜30%。
所述尾气液与活性炭原材料的质量比例为 0. 5〜2. 5 : 1。
所述干燥的温度为 120〜600°C。
干燥后的混合物水分含量为 5%〜30%。
本发明的显著优点： 1、 利用制备活性炭的原材料 （例木屑） 的多孔性， 以活性炭原材料作为回 收低浓度酸的载体进行磷酸吸附， 解决了尾气液难以过滤问题。
2、 通过对已吸附回收液中磷酸的活性炭原材料的干燥， 解决回收液难以蒸 发浓縮的问题， 同时干燥过程中磷酸浓度增加， 增强了磷酸对活性炭原材料 （例 木屑）的刻蚀， 提高磷酸法活性炭的质量。
3、 工艺操作简单， 易于工业化推广。
4、 用生产活性炭的原料作为吸附载体， 易于取得， 生产成本低， 有显著的 经济效益。
具体实施方式
在收集尾气酸部分： 尾气液中磷酸的质量浓度控制在 5〜30%。
在混合部分： 尾气液与多孔性活性炭原材料的质量比按 0. 5〜2. 5 : 1， 混合 搅拌。
干燥部分： 所述干燥的温度为 120〜600°C， 干燥后的混合物水分 5%〜30%。 采用该尾气磷酸回收生产过程的其余步骤均按照常规的现有技术进行。 以下是本发明的实施例，进一步说明本发明， 但是本发明的实施方式不仅限 于此。
实施例 1
含 5% (百分比表示质量比）磷酸的尾气液与含水量 30%的木屑按质量比 2 : 1 进行混合， 经 550°C热风的气流干燥后木屑中水分含量为 5%， 干燥后木屑中磷酸 含量为 15%。干燥后的木屑作为磷酸法活性炭的原料与磷酸溶液按一定比例混合 生产磷酸法活性炭。
实施例 2
含 15% (百分比表示质量比）磷酸的尾气液与含水量 1%的木屑按质量比 1 : 1 进行混合， 经 150°C热风的气流干燥后木屑中水分含量为 30%， 干燥后木屑中磷 酸含量为 13%。干燥后的木屑作为磷酸法活性炭的原料与磷酸溶液按一定比例混 合生产磷酸法活性炭。
实施例 3
含 30% (百分比表示质量比)磷酸的尾气液与含水量 5%的木屑按质量比 2. 5 : 1 进行混合， 经 30CTC热风的气流干燥后木屑中水分含量为 15%， 干燥后木屑中磷 酸含量为 27%。干燥后的木屑作为磷酸法活性炭的原料与磷酸溶液按一定比例混 合生产磷酸法活性炭。

Claims

2013/091566 权 禾 'J 要 求 书 PCT/CN2012/087103 一种磷酸法活性炭炭化、 活化反应回收的尾气磷酸的利用方法， 其特征在于： 将含磷酸的反应尾气液收集， 与活性炭原材料混合均匀， 经干燥， 使反应尾气 液中的磷酸吸附在活性炭原材料上，干燥后的混合物作为制备磷酸法活性炭的 原料。
根据权利要求 1所述的磷酸法活性炭炭化、活化反应回收的尾气磷酸的利用方 法， 其特征在于： 所述反应尾气液中磷酸的质量浓度为 5%〜30%。
根据权利要求 1所述的磷酸法活性炭炭化、活化反应回收的尾气磷酸的利用方 法， 其特征在于： 所述活性炭原材料的水分含量为 1%〜30%。
根据权利要求 1所述的磷酸法活性炭炭化、活化反应回收的尾气磷酸的利用方 法， 其特征在于： 所述尾气液与活性炭原材料的质量比例为 0. 5〜2. 5 : 1。
根据权利要求 1所述的磷酸法活性炭炭化、活化反应回收的尾气磷酸的利用方 法， 其特征在于： 所述干燥的温度为 120-600°C。
根据权利要求 1所述的磷酸法活性炭炭化、活化反应回收的尾气磷酸的利用方 法， 其特征在于： 干燥后的混合物水分含量为 5%〜30%。
PCT/CN2012/087103 2011-12-21 2012-12-21 磷酸法活性炭炭化、活化反应回收的尾气磷酸的利用方法 WO2013091566A1 (zh)

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CN102515163A (zh) * 2011-12-21 2012-06-27 福建元力活性炭股份有限公司 磷酸法活性炭炭化、活化反应尾气回收磷酸利用方法
CN105582785B (zh) * 2014-01-07 2018-01-19 上海三山炭业科技有限公司 化学法活性炭生产尾气的净化及回收系统
CN104437062B (zh) * 2014-12-17 2017-09-29 福建元力活性炭股份有限公司 一种用于回收磷酸法活性炭尾气中磷酸的装置及其方法
CN109052394A (zh) * 2018-07-25 2018-12-21 贵州森环活性炭有限公司 一种磷酸法活性炭活化尾气净化循环利用的方法
CN111533098B (zh) * 2020-06-10 2022-11-01 吉安龙净炭素科技有限公司 磷酸法活性炭生产中回收磷酸的高效纯化方法

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