[excerpt] 

In industrial scale reactions for hydrocarbon to olefin conversion, the desired products are typically lighter olefins such as ethylene and propylene. In addition to controlling the overall conversion rate and the light olefin selectivity, it can also be desirable to control the ratio of ethylene to propylene produced by a reaction.  A further consideration in conversion reactions is the cost required to perform the conversion reaction. A conventional reactor for performing a controlled oxygenates-to-olefin reaction can require multiple risers nearly 200 feet in height and hundreds of tons of catalyst for converting the oxygenate feedstock. 

US Pat No 6,166,282B1 discloses a process for converting oxygenates to olefins in a reactor with two reaction zones. Feedstock is introduced into a lower, sense phase zone from a single inlet to effect a partial conversion to light olefins. The sense phase zone... 

Download a PDF of the Patent

Cambridge, Massachusetts, January 10, 2010… Cincinnati based Process Plus, a Full Service Engineering and Design firm announced its strategic alliance with Cambridge Chemical Technologies (CCTI), a technology based process engineering firm located in Cambridge, Massachusetts. Together, the two engineering firms will provide a greater level of expertise and knowledge to the Chemical Processing Industry both nationally and internationally.

CCTI and Process Plus began their relationship while working for a mutual client in Massachusetts. The two firms provide similar engineering services, including process engineering and design, although each firm holds greater expertise than the other in particular areas of work. The complimentary capabilities will allow CCTI and Process Plus to provide superior engineering services to existing and potential clients.

CCTI is a chemical process engineering firm whose services include basic engineering, technology transfer & licensing, and process technology commercialization. CCTI delivers on projects large and small and customizes their services to the client’s needs by complementing and enhancing the client’s technical strengths, thereby building lasting value into the organizations. CCTI’s design philosophy draws upon the design standards of the petrochemical and refining industries – standards proven to provide un-matched online performance.

Process Plus is a Multi-Disciplined, Full Service Engineering firm. Process Plus’ disciplines include Process Engineering & Design, Architecture, Civil & Structural Engineering, Electrical Engineering, Building & Mechanical Engineering, Instrumentation, Automation & Controls, Validation, Packaging & Material Handling, Construction Management & Support and Procurement. Process Plus delivers comprehensive and specialized services on projects of all sizes, throughout all phases.

CCTI’s expertise in consulting on difficult technical problems, front-end studies, and Basic Engineering Packages will compliment Process Plus’ project execution and full service capabilities. CCTI Principal and CEO, Waheed Mukaddam states, “An alliance with Process Plus formalizes a great working relationship. The breadth of knowledge Process Plus’ engineers have will allow us to better serve our clients.”

“CCTI’s process technology development capabilities and technical expertise are outstanding. As manufacturing companies down-size, CCTI is a great firm to bring in on the front end of a project to recommend substantial operational improvements and efficiencies which can provide immediate payback.” Process Plus President, Jeff Rankin. 

Process Plus is a privately held engineering firm headquartered in Forest Park. They provide process engineering, architectural, and construction services to the Chemical, Food & Beverage, Pharmaceutical and Consumer Products Industries. Process Plus serves clients throughout North America, South America, Europe, Africa, and Asia.

Cambridge Chemical Technologies is headquartered in Cambridge, MA. They provide decades of chemical process design expertise to a new type of engineering organization: client-centered and efficient, rigorous and deep-thinking, with a creative approach to client needs. Their core strength is in the basic process design of chemical, petrochemical and alternative energy facilities. CCTI serves clients throughout the world with special experience in China.

For more information on Process Plus please visit www.ProcessPlus.com 

[excerpt]

Heat flux, the heat transferred per unit surface area (Q/A), is equal to the product of the heat-transfer coefficient and the temperature difference across the exchanger:

The heat exchanger acts as a series of resistances represented by the inside heat-transfer coefficient hi, the wall resistance rw, and the outside coefficient A0. The heat transferred must pass through every resistance and the flux is constant across each of them. Therefore, for a vertical thermosiphon reboiler with boiling in the tubes, the heat flux expression becomes...

Download a PDF of the Complete Article