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公开(公告)号：US5271918A
公开(公告)日：1993-12-21
申请号：US666957
申请日：1991-03-11
IPC分类号： C01B7/19
摘要： A method is provided wherein the equilibrium HF concentration in the mixture of HF, sulfuric acid and water fed to an HF reaction furnace is greatly reduced by injecting a controlled amount of steam into an HF-removal process wherein the sulfuric acid mixture is also contacted with the hot HF gas leaving the HF reaction furnace. Reducing the HF concentration in this manner significantly improves furnace performance.The purpose of injecting steam is to adjust the water content of the mixture to the optimum value (about 12.5 weight percent) for HF removal, as well as to supply the heat required for HF removal without the need for an indirect heat exchanger.An additional advantage to this method is that since direct steam injection adds water to the process, in order to keep the furnace feed acid water concentration at the desirable level of less than 1%, oleum or SO.sub.3 must be added to react with the excess water. Since the reaction of water and SO.sub.3 is exothermic, this supplies additional heat to the process and no indirect heat exchanger is needed to achieve the desired high furnace feed acid temperature (>100.degree. C.).
摘要翻译： 提供了一种方法，其中通过将受控量的蒸汽注入HF去除方法中，HF，硫酸和加入HF反应炉的水的混合物中的平衡HF浓度大大降低，其中硫酸混合物也与 离开HF反应炉的热HF气体。 以这种方式降低HF浓度显着提高了炉的性能。 注入蒸汽的目的是将混合物的水含量调节至最佳值（约12.5重量％），以除去HF，以及提供HF除去所需的热量，而不需要间接热交换器。 该方法的另一个优点是，由于直接蒸汽注入为该方法添加了水，为了使炉送入酸水浓度达到小于1％的期望水平，必须加入发烟硫酸或SO 3以与多余的水反应 。 由于水和SO 3的反应是放热的，因此为该方法提供额外的热量，并且不需要间接热交换器来实现所需的高炉进料酸温度（> 100℃）。
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公开(公告)号：US5414154A
公开(公告)日：1995-05-09
申请号：US254729
申请日：1994-06-06
CPC分类号： C07C37/86 , C07C37/685 , C07C37/70 , Y02P20/52
摘要： A process for the reduction of methylbenzofuran (MBF) impurities in phenol obtained from the decomposition product of cumene hydroperoxide requires treating the phenol to reduce the level of acetol, contacting the phenol containing a low level of acetol with an acid resin at sufficient temperature and residence time to reduce the level of MBF by conversion to higher boiling compounds, then distilling the phenol to separate phenol from higher boiling compounds. The phenol may be treated in known ways, such as by treatment with an amine, to reduce the level of acetol. The phenol containing a low level of acetol is contacted with a strong acid resin to reduce the level MBF.
摘要翻译： 从氢过氧化枯烯的分解产物中还原苯酚中的甲基苯并呋喃（MBF）杂质的方法需要处理苯酚以降低丙酮醇的含量，使含有低水平丙酮醇的苯酚与酸树脂在足够的温度和室温下接触 时间通过转化为较高沸点化合物来降低MBF的水平，然后蒸馏苯酚从高沸点化合物分离苯酚。 苯酚可以以已知方式处理，例如通过用胺处理，以降低丙酮醇的含量。 含有低水平丙酮醇的苯酚与强酸树脂接触以降低MBF的含量。
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3.发明授权Electrodialytic process for the conversion of impure soda values to sodium hydroxide and carbon dioxide 失效用于将不纯苏打碱转化为氢氧化钠和二氧化碳的电渗析方法
公开(公告)号：US4238305A
公开(公告)日：1980-12-09
申请号：US88781
申请日：1979-10-29
CPC分类号： B01D61/445 , C01D1/04
摘要： An electrodialytic process for the conversion of soda sources containing anionic and optionally nonionic impurities to high purity, high strength sodium hydroxide and carbon dioxide gas is disclosed.
摘要翻译： 公开了一种用于将含有阴离子和任选的非离子杂质的苏打水转化成高纯度，高强度氢氧化钠和二氧化碳气体的电渗析方法。
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公开(公告)号：US4219396A
公开(公告)日：1980-08-26
申请号：US63229
申请日：1979-08-03
CPC分类号： B01D61/445
摘要： An improved process for the electrodialysis of aqueous NaCl which operates at high current efficiency and low unit cell voltage drop to produce high strength, high purity Na.sub.2 CO.sub.3 and either high purity HCl or CaCl.sub.2 by utilizing cation permselective, anion permselective and bipolar membranes wherein the solutions on both sides of the anion permselective membrane are acidic.
摘要翻译： 一种用于电渗析NaCl水溶液的改进方法，其以高电流效率和低单位电池电压降运行，以通过利用阳离子选择性，阴离子选择性和双极膜产生高强度，高纯度Na 2 CO 3和高纯度HCl或CaCl 2，其中溶液 阴离子选择性渗透膜的两侧都是酸性的。
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公开(公告)号：US4756899A
公开(公告)日：1988-07-12
申请号：US14422
申请日：1987-02-12
申请人： Theodore J. Jenczewski , Robert L. Sturtevant , Thomas R. Morgan , Barry J. Boghean , Donald C. Butt
发明人： Theodore J. Jenczewski , Robert L. Sturtevant , Thomas R. Morgan , Barry J. Boghean , Donald C. Butt
摘要： A process for manufacturing high purity anhydrous hydrogen fluoride (HF) having low levels of arsenic impurity by contacting anhydrous hydrogen fluoride product, or an intermediate product obtained during the manufacture of HF, with hydrogen peroxide in the presence of a catalyst which comprises effective amounts of molybdenum or an inorganic molybdenum compound and a phosphate compound. The volatile trivalent arsenic impurity in the anhydrous hydrogen fluoride is oxidized to a non-volatile pentavalent arsenic compound and the resultant mixture is distilled to recover high purity anhydrous hydrogen fluoride with reduced levels of arsenic impurity. In one embodiment, an oxidizing agent such as nitric acid or a nitrate salt is added to the reaction mixture to oxidize organic contaminants.
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公开(公告)号：US4552635A
公开(公告)日：1985-11-12
申请号：US639528
申请日：1984-08-09
CPC分类号： C01B17/745 , B01D53/501 , B01D61/445
摘要： Methods for removal of sulfur oxides, e.g., SO.sub.2 and SO.sub.3, from sulfuric acid tail gases by alkaline solution scrubbing, acidification of the alkaline scrubbing solution containing absorbed sulfur valves, liberation of concentrated SO.sub.2 from the acidified solution and regeneration of the alkaline scrubbing solution by means of two- or three-compartment electrodialytic water splitters are disclosed. A completely closed loop method suitable for continuous removal of sulfur oxides from sulfuric acid tail gas, recovery of concentrated SO.sub.2 for use in sulfuric acid plants, regeneration of alkaline scrubbing process solution and improvement in the water balance in sulfuric acid plant by use of two- and three-compartment electrodialytic water splitters is also disclosed.
摘要翻译： 通过碱性溶液洗涤从硫酸尾气中除去SO2和SO3的硫氧化物的方法，含有吸收的硫化氢阀的碱性洗涤溶液的酸化，浓缩的SO 2从酸化溶液中的释放和碱性洗涤溶液的再生 公开了两室或三室电渗析水分离器的方法。 一种完全闭环的方法，适用于从硫酸尾气中连续除去硫氧化物，回收硫酸设备中使用的浓硫酸，再生碱性洗涤工艺溶液，并通过使用二氧化硫改善硫酸厂的水分平衡， 还公开了三室电渗析水分离器。
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