Question: What multinational chemical corporation headquartered in Midland, Michigan acquired Exergonix, Inc?

Context articles: Allied Corp.
Dow Chemical Company
Mitsubishi Chemical Corporation
Afton Chemical
Hooker Chemical Company
Merck Group
Dow Corning
Hess Oil and Chemical
Exergonix, Inc.
Crompton Corporation

Allied Corp. was a major American company with operations in the chemical, aerospace, automotive, oil and gas industries.
 It was initially formed in 1920 as the Allied Chemical and Dye Corporation as an amalgamation of five chemical companies.
 In 1958 it was renamed Allied Chemical Corporation when it diversified into oil and gas exploration.
 Allied Chemical then became Allied Corporation in 1981.
 In 1985 Allied merged with the Signal Companies to become AlliedSignal.
 AlliedSignal would eventually acquire Honeywell in 1999 and then adopt its name.
The Dow Chemical Company, commonly referred to as Dow, was an American multinational chemical corporation headquartered in Midland, Michigan, United States, and the predecessor of the merged company DowDuPont.
 In 2007, it was the second-largest chemical manufacturer in the world by revenue (after BASF) and as of February 2009, the third-largest chemical company in the world by market capitalization (after BASF and DuPont).
 It ranked second in the world by chemical production in 2014.
Mitsubishi Chemical Corporation (三菱化学株式会社 , Mitsubishi Kagaku Kabushiki-gaisha ) , or MCC, is a subsidiary of Mitsubishi Chemical Holdings Corporation.
 It was a Japanese corporation, that merged with Mitsubishi Pharma Corporation in 2005 to create Mitsubishi Chemical Holdings Corporation.
Afton Chemical Corporation develops and manufactures petroleum additives, including driveline, engine oil, fuel and industrial additives.
 Afton Chemical Corporation is headquartered in Richmond, Virginia, and has
Hooker Chemical Company, also known as Hooker Electrochemical Company and now Occidental Chemical Corporation, was an American chemical company that produced chlor-alkali products from 1903 to 1968.
 In 1922, Hooker bought the S. Wander & Sons company for the retail sales of lye and chlorinated lime.
 Hooker Chemical is best known for the chemical waste site Love Canal, which it sold in 1953, and led to a lengthy lawsuit several decades later.
The Merck Group, branded and commonly known as Merck, is a German multinational chemical, pharmaceutical and life sciences company headquartered in Darmstadt, with around 50,000 employees in around 70 countries.
 Merck was founded in 1668 and is the world's oldest operating chemical and pharmaceutical company, as well as one of the largest pharmaceutical companies in the world.
Dow Corning is an American multinational corporation headquartered in Midland, Michigan, United States.
 Originally established as a joint venture between the Dow Chemical Company and Corning Incorporated, it is now owned by DowDuPont and specializes in silicone and silicon-based technology, and is the largest silicone product producer in the world.
Hess Oil and Chemical Corporation was a company begun in the 1930s by Leon Hess of New Jersey to distribute heating oil.
 It expanded over the years to include refining and marketing of heating oil and other petroleum products through terminals and gasoline stations.
 In 1968, Hess Oil and Chemical Corporation merged with Amerada Petroleum Corporation into Amerada Hess Corporation (NYSE: HES).
 Since 2006, the merged company has been called Hess Corporation.
 Before the merger, Hess Oil and Chemical developed the Hess Oil Virgin Islands Corporation (HOVIC) Refinery on St. Croix, United States Virgin Islands, at the time the largest oil refinery in the world.
 After 1998 the refinery built by HOVIC operated under the name HOVENSA.
 It is a joint venture with PDVSA and is 50% owned by Hess Corporation.
 HOVENSA announced plans to close later on in the year on January 18, 2012.
Exergonix Inc, is an energy storage company based in Kansas City, Missouri.
 It was founded in 2010, after spinning out of Kokam America, Inc., which was acquired by Dow Chemical Company in 2009.
 Exergonix develops, manufactures and deploys community-level and grid energy storage to supply peak-shaving, demand-management, and smart grid capabilities to the grid and micro-grid.
Crompton Corporation (NYSE: CK ), (formerly Crompton and Knowles), was a chemical research, production, sales and distribution company headquartered in Middlebury, Connecticut.
 The company produced specialty chemicals used for polymers, fire suppressants and retardants, pool and spa water purification systems and various other applications.
 In 2005, Crompton merged with Great Lakes Chemical Corporation to become Chemtura.