Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
  • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
  • B01J20/28078—Pore diameter
  • B01J20/28083—Pore diameter being in the range 2-50 nm, i.e. mesopores
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
  • B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
  • B01J20/046—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium containing halogens, e.g. halides
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
  • B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
  • B01J20/08—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
  • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
  • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
  • B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
  • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
  • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
  • B01J20/28057—Surface area, e.g. B.E.T specific surface area
  • B01J20/28061—Surface area, e.g. B.E.T specific surface area being in the range 100-500 m2/g
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
  • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
  • B01J20/28069—Pore volume, e.g. total pore volume, mesopore volume, micropore volume
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/30—Processes for preparing, regenerating, or reactivating
  • B01J20/34—Regenerating or reactivating
  • B01J20/3433—Regenerating or reactivating of sorbents or filter aids other than those covered by B01J20/3408 - B01J20/3425

Definitions

• the present invention relates to a desiccant comprising a solid, porous carrier with a hygroscopic material impregnated therein, in particular a hygroscopic salt such as a chloride.
• a desiccant of this kind which may for example be used as an energy storage material in heat pumps or as an absorption or adsorption agent in air conditioning plants, is for example known from Japanese patent applications Nos, 55039240 and 03009767.
• the object of the present invention is to provide a desiccant which possesses improved absorption characteristics .
• the desiccant according to the invention is characterized in that the carrier has a surface area of approx. 200 - 350 m 2 /g and/or a pore volume of approx, 0.8 - 1.5 cm 3 /g and/or a pore diameter of approx. 150 - 250 A.
• the material of the carrier itself is not active in the drying process, so that the material of the carrier can be selected entirely on the basis of favourable carrier properties.
• Possible materials for the carrier comprise silica, alumina, carbon black, paper or the like.
• the carrier is preferably supplied in the form of particles, in particular spheres having a diameter of approx. 2.5 - 5 mm. Said spheres can be imparted relatively favourable mechanical characteristics, so that particles are obtained which are capable of withstanding a compressive force of 8 kg per particle in a crush test.
• a porous material also a material formed into a honeycomb structure or the like may be selected, or a porous material which has been formed into a honeycomb structure. The invention will be explained in more detail hereafter by means of a number of examples.
• Silica having a pore volume of approx. 1.2 cmVg, a surface area of approx. 260 m 2 /g and an average pore diameter of approx. 200 A was selected as the carrier for the desiccant.
• 1 kg of silica was treated with a solution of 1200 ml of the following composition: 300 g of LiCl, 20 g of Ca(OH) 2 , 15 g of CaCl 2 and 1635 ml of water. After treatment and drying, a desiccant having a bulk density of 0.47 g/cm 3 was obtained.
• a dynamic absorption test was carried out under the following circumstances. a. the initial weight of the desiccant was 20 g, b.
• a dynamic absorption test was carried out under the following conditions: a. the initial weight of the desiccant was 4 kg, b. an air flow was led through the desiccant at a flow rate of 137 m 3 /h and an adsorption time of 30 min., c. the desiccant was regenerated at 50 °C for a period of 30 min.
• Silica (100 g) having a surface area of approx. 260 m 2 /g, a pore volume of approx. 1.2 cm 3 /g, and an average pore diameter of approx. 200 A was treated with 120 ml of a lithium chloride solution (230 g of LiCl in 1635 ml of water) . The material was then regenerated again an impregnated with 120 ml of LiCl (100 g) in 1635 ml of water. With this desiccant the dynamic absorption test described in example 1 resulted in an absorption of approx. 5.5 g of moisture during each cycle.
• Alumina having a pore volume of approx. 1.0 cm 3 /g, a surface area of approx. 260 m /g and an average pore diameter of approx. 154 A was selected as the carrier for the desiccant.
• 1 kg of alumina was treated with a solution of 1000 ml of the following composition: 300 g of LiCl, 20 g of CaCl 2 and 1635 ml of water. After treatment and drying a desiccant having a bulk density of 0.49 g/cm 3 was obtained.
• a static adsorption test showed that the desiccant had a high adsorption capacity, unlike untreated alumina, whose adsorption capacity is only very small.
• a dynamic absorption test was carried out under the following circumstances. a. the initial weight of the desiccant was 20 g, b. an air flow was led through the desiccant at a flow rate of 1.48 m 3 /h, an air inlet temperature of Tiniet - 15 °C and a relative air humidity at the inlet of 80%, c. the desiccant was regenerated at 100 °C with an air flow of 20 m 3 /h for 15 minutes.
• the desiccant can be said to exhibit the following advantageous characteristics:
• C the capacity to produce an air flow having any relative humidity (20 - 95%) during a regeneration process
• D a small bulk density
• said desiccant could be used in the following devices: airconditioning plants for utilising waste energy (supermarkets, offices and the like) , airconditioning plants for passenger cars, caravans and the like, as a desiccant for the atmospheric treatment and pressure treatment of air, as an agent for producing air having a specified relative humidity, as a material in a heat pump, and as an energy storage material.

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• Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Inorganic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Nanotechnology (AREA)
• Drying Of Gases (AREA)
• Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Applications Claiming Priority (3)

Publications (1)

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ID=19765629

Family Applications (1)

Country Status (4)

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• 1997
  • 1997-09-08 NL NL1006965A patent/NL1006965C2/nl not_active IP Right Cessation
• 1998
  • 1998-09-02 WO PCT/NL1998/000498 patent/WO1999012641A1/en not_active Application Discontinuation
  • 1998-09-02 EP EP98941913A patent/EP1019187A1/de not_active Withdrawn
  • 1998-09-02 AU AU90069/98A patent/AU9006998A/en not_active Abandoned

Non-Patent Citations (1)

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