Model 4523 Reactor, Fixed Head, 1 liter.

 

Fixed Head Reactors

Parr now offers all of its laboratory reactors and most of its non-stirred pressure vessels in a fixed head design. This includes all reactors with volumes from 25 mL to 7.5 liters. In these reactors the head of the vessel may remain fixed in the reactor support stand. All attachments to the head: gas and liquid feed and discharge lines, cooling water, vapor take-off and condenser, thermocouple and any electrical leads can remain permanently in place. The reactor is opened by simply removing the split ring and lowering the cylinder away from the head, leaving all of the attachments undisturbed. If desired the complete vessel assembly can be removed from the head support plate.

Close up view of a fixed head reactor with the cylinder and heater lowered.

In the Series 4560 and 4590 Reactors, the operator lowers the heater and removes the cylinder by hand. In the 1 and 2 liter Series 4520 and 4530 reactors, and in the 600 mL and 1200 mL Series 4540 high pressure models, a manual lift and support mechanism is provided for raising and lowering the cylinder. In the Series 4550 and 4580 1 and 2 gallon units, as well as the 4570 Series 1 and 1.8 liter sizes, the cylinder is raised and lowered by a pneumatic lift mechanism.

 

 

 


Moveable Vessel Reactors

4544 Reactor, 600 mL, Moveable Vessel, Quick-release Split Ring, and a 4848 Controller shown with optional Expansion Modules.

As an alternate to the fixed head designs described in the previous section, all Parr reactors can be furnished in designs which allow the entire vessel to be removed as a complete assembly from the support stand allowing for charging, product recovery, and cleaning. In the smaller and mid-sized models the entire vessel is simply lifted out of the heater by hand. In the larger 1, 2, 5 gallon, and 10 liter models the vessel can be opened and closed with the cylinder remaining in the heater, but the head must be lifted out by hand. In the larger 5 gallon and 10 liter models a chain hoist is provided for lifting the heavier head and cylinder.

These moveable reactors will be attractive to users that intend to operate fairly simple batch systems rather than continuous flow arrangements, and that want to be able to remove the vessel for product recovery, charging or cleaning. They will also appeal to those that need to prepare the vessel in a special atmosphere, or want to clean the cylinder and stirrer at a site away from the reactor stand and heater. There is also the added advantage of being less expensive than the fixed head models since they do not require the more elaborate head or the cylinder and heater lift mechanism.

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