Reactors open plate

In the following part, four reactors that have been extensively studied in our lab are described the open plate reactor (OPR) - the Alfa-Laval reactor technology (ART ) plate reactor, the Shimtec reactor from Chart Industries, the Corning (glass reactor), and the DeanHex reactor which has been constructed with SiC and stainless steel. 

Prat, L., Devatine, A., Cognet, P., Cabassud, M., Gourdon, C., Elgue, S., and Chopard, E. (2005) Performance evaluation of a novel concept open plate reactor applied... 

Haugwitz, S., Hagander, P. and Noren, T. (2007). Modelling and control of a novel heat exchanger reactor, the Open Plate Reactor. Control Engineering Practice, Vol. 15, pp. 779-792. 

Introduced only recently in the literature (Haugwitz et al., 2007), the open plate reactor (OPR) is based upon the well-known Alfa Laval Plate Heat Exchanger (see Chapter 4). The OPR is specifically designed to handle highly exo- or endothermic and fast reactions. The aim is to safely produce the chemicals using highly concentrated reactant solutions. The main new features of the OPR, needed to reach this objective, are the improved heat transfer capacity and the micro-mixing conditions inside the reactor. It consists of reactor plates, inside which the reactants mix and... 

The light-sensitive BZ reaction demonstrates all basic features of excitable media of quite different nature and represents a very suitable experimental system to study controlled motion of spiral waves. In the experiments reported below an open gel reactor is used [29-31]. The catalyst is immobilized in a silicahydrogel layer of 0.5 mm thickness prepared on a plate... 

Each section consists of a reaction plate where the reaction mixture flows, surrounded by two cooling plates containing the UE. The reactants and catalyst are stored separately and put into contact at the opening of the first reaction plate. The pilot holdup is typically 1.5 1. The successive plates of the reactor can be represented as shown in Figure 12.1. Inside the reactive plate (RP), the environment of the reaction mixture is composed of PEEK. The UE flows between two stainless steel plates, the sandwich plate (SP) and the transition plate (TP). 

Reactors Assembled cost is 5/lb. Dished bottoms, open tops, height equal to diameter, bottom surface equals 1.5 times the surface of a flat plate of the same diameter. Tanks of over 1500 gal capacity are of 1/4" plate, smaller ones of 3/16" plate. Freeboard equals volume of the dished head. 

The simplest choice of a liquid distributor is a perforated plate with 10 openings/dm2 (10 openings/15.5 in2), where the gas enters through several risers about 15 cm (5.9 in) high. More sophisticated distributors like caps ate also used. The thickness of the liquid film developed in trickle-bed reactors has been estimated to vary between 0.01 and 0.2 mm (Perry and Green, 1999). 

After each growth cycle, the reactors must be opened, the wafers removed, and the lower portion of the reactor physically cleaned. The lower quartz reactor and the bottom plate (base plate) are scraped clean using a metal tool, and the particulate material (mixture of GaAs, GaAsP, arsenic oxides and phosphorus oxides) is collected in a metal container positioned below the vertical reactor. 

The band width in this study was limited to 150 mm but could exceed 1000 mm, thus opening a route to large-scale micro structured plate-like reactors comparable to the large-scale micro (or mini) structured heat exchangers from Heatric [96], These are manufactured by diffusion welding of stacked plates (Figure 4.114). 

The oil-covered reaction mixture is heated on a hot plate to about 110°, and the now fluid metal layer is poured into 200 ml. of mineral oil in a 1-1. beaker. It may be necessary to spoon the melted metal mixture from the reactor if it will not pour readily. The solidified melt, which consists of sodium embedded with 10 to 20% of finely divided calcium, is cut into pieces small enough to fit through a 24/40 standard taper opening, f A pair of tin snips or large scissors makes a convenient tool for cutting sodium. 

To minimize the pulsation in the plant, a reduction of pressure pulsations by orifice plates was investigated. Therefore an orifice with an inner diameter of 13,5 mm (pipe diameter 80 mm) was placed at the inlet of the reactor. This is the position where maximum flow pulsation arises (open ended pipe). 

On open reactor axis at 1.5 m elevation of sliding screen top plate... 

In all these fields the traditional cross-flow reactor is represented. This reactor consists of a great number of parallel porous plates separated from each other by corrugated planes or by a similar regular structure, giving rise to a compact system of parallel closed channels, with only entrance and exit openings perpendicular to the main flow direction (cf. Fig. 3). The parallel-channel system of this traditional cross-flow reactor is arranged so that the inflows of the two fluids are separated 90°. This means that the two fluids will not be mixed in the same channels and the fluids will penetrate the plane plates from different sides. The fluids can meet only inside the porous catalytic plates where the reactions proceed. 

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